There are millions of dollars being made in the Australian marijuana business but these entrepreneurs and investors aren't risking jail to make their fortunes. They're betting big on the home grown medicinal marijuana industry and riding the "pot stock" boom.

On Monday night Four Corners brings you the undercover investigation that has left social media giant Facebook reeling through the unmasking of the secretive political consulting firm Cambridge Analytica and the dirty tricks they deployed. Four months in the making, this ITN investigation for Channel 4 in the UK used hidden cameras to reveal the tactics used by the UK firm Cambridge Anayltica to influence elections and undermine the democratic process in several countries. And the company's former director of research, Chris Wylie, explains how they did it.

The Australia Taxation Office is a formidable enforcer with extraordinary powers. It can raid your home or business without a warrant, it can compel you to answer questions and treat you as guilty until proven innocent. While there's strong public support for a crackdown on major multinational corporations to force them to pay their fair share, there is growing concern that the ATO is targeting people a long way from the big end of town. In a major joint Four Corners-Fairfax investigation, reporter Adele Ferguson puts the actions of the ATO under the microscope, examining how it uses its extensive powers.

Australia's superannuation retirement savings pool is enormous. At $2.5 trillion dollars, it's one of the largest in the world. But there are fears that even that huge sum of money won't be enough. Millennials are entering a very different workforce from the one that existed 30 years ago when compulsory superannuation was adopted. In the broader economy, it's estimated that between $3 and $6 billion dollars' worth of super entitlements per year are not being paid. Now there are calls to take a fresh look at super and make some major reforms.

The sex scandal that has engulfed American film producer Harvey Weinstein triggered headlines around the world and prompted a searing discussion about the treatment of women. Much of the attention has focused on the actresses who say they were preyed upon by the movie mogul. Behind the scenes, there were other women, work colleagues and employees, who allege that Harvey Weinstein used his power to abuse them. They kept their experiences secret for decades, fearing legal action and reprisal. Now they are speaking out.

The numbers tell the story. Australia's population is growing fast. Across the country, we've added almost 400,000 people in the past year alone. The populations of Melbourne, Sydney, Brisbane and Perth have expanded by nearly 3 million extra people in the last 10 years. And we're feeling the strain. It's time for the nation to have a conversation about how big Australia is going to grow.

Across Australia, farmers, small businesses, government planners and major corporations have stopped waiting for politicians to decide whether climate change is real. They're acting now. Mounting evidence suggests our changing climate is having an impact on everything - from what we grow, eat and drink, to house prices and the cost of insurance. Four Corners has travelled from coast to coast to chart how Australians are adapting to the new weather challenges.

Secret parties, sly booze and slinky cocktail dresses are a long way from the conservative images usually associated with the Islamic Republic of Iran. For decades the republic's morals police have enforced strict rules that seem to cover just about everything, from dog ownership, which is banned, to clothing. Drinking alcohol is punishable with 40 lashes. Repeat offenders can face the death penalty. Despite the rules, many young people in Iran are rebelling. They're taking their lives in their hands and defying the regime to party in secret.

For four long years Islamic State ruled its "caliphate" from its capital, the city of Raqqa. IS propaganda painted it as a pure paradise and extremists travelled from around the globe to join the terror group. Now the city is giving up its secrets. On Four Corners Middle East correspondent Matt Brown goes on an intense journey into the city freed from the Islamic State dictatorship.

They are the hidden workforce kept behind closed doors. Domestic workers, in Australia, living in slave like conditions and made to work around the clock. This powerful Four Corners reveals disturbing cases of extreme overwork and underpayment and explains why those responsible are getting away with it.

He's the financial mastermind who laundered money for the world's most dangerous terrorists and criminals. His operations stretched across the globe, helping everyone from Mexican drug cartels to bikie gangs hide their criminal profits. He also operated right here in Australia. He evaded capture for decades until an unprecedented international police operation, initiated by Australia, set out to take him down. With exclusive access, Four Corners takes you inside this extraordinary undercover investigation into money launderer Altaf Khanani.

Justice Lionel Murphy was one of the most senior political and legal figures in Australia. He was also at the centre of one of the most extraordinary scandals in our nation's history. Now this sensational chapter in Australia's history has been reopened with the release of documents kept secret for 30 years. Four Corners takes you into the heart of this story with powerful first hand accounts from many of the key players in this astonishing saga. Some are speaking publicly for the first time in 30 years.

In the week the same-sex marriage survey results will be announced, Four Corners takes you into the battle for control raging inside the Liberal Party. As reporter Michael Brissenden shows, whatever the results of the postal survey, the politicking will be far from over. When Malcom Turnbull took the leadership of the Liberal Party he promised to do things differently, end the slogans and act decisively. But for the past two years he's been unable to stamp his authority on his government.

Four Corners will take you inside the secretive world of tax havens where corporations and the wealthy operate far from public view. In an investigation that spans the globe, Four Corners will reveal the lengths some of the world's most powerful business figures and global corporations are going to, to avoid paying tax.

For the first time since the dark days of Hitler's Nazi Germany, a right-wing nationalist party is centre stage in German politics. Right-wing extremism in Germany has surged to its highest level since the downfall of the Third Reich, with a record number of attacks against asylum seekers and their supporters. This film, from the BBC's Panorama program, charts the rise of one notorious anti-immigrant group which stands accused of a wave of violent attacks. In an exclusive interview, one of the group's ringleaders talks for the first time about his motivations and his actions.

From the start, Australia's National Broadband Network was billed as a game changer that would future-proof the nation by delivering super fast internet services. Almost a decade on from those promises, there's a growing number of angry residential customers and small businesses who are bitterly disappointed with the NBN. On Monday night, as the NBN reaches a milestone, passing the half-way point in its rollout, Four Corners investigates the problems fuelling this dissatisfaction.

In a special edition of Four Corners, Hillary Clinton, in her only Australian television interview, talks with Sarah Ferguson. This riveting conversation, recorded in New York, takes us into the heart and mind of the woman at the centre of the most stunning election loss in modern US history. This is a very different Hillary Clinton to the managed political performer. Candid, open and at times angry, the former presidential candidate talks about what went wrong and her fears for the future.

It's one of the biggest environmental scandals in Australian history. Harmful chemicals, leaching into the ground and waterways, contaminating the water relied upon for drinking. These chemicals are the toxic legacy of fire-fighting foam, used for decades on Defence Force bases and other sites around Australia. On Monday, Four Corners investigates the gross failures by the Department of Defence that led to this chemical contamination.

When Four Corners travelled to India to investigate the activities of the giant Adani group, they soon discovered the power of the company. While attempting to film and gather information about Adani's operations, the Four Corners team had their cameras shut down, their footage deleted and were questioned for hours by police. Four Corners examines the troubled corporate history of the Adani group - the corporate colossus that plans to build Australia's biggest mine site.

Every year more than 30,000 people are kidnapped around the world. A small number are taken for political reasons, many more are held for financial gain. With exclusive access to leading hostage recovery agents, The Ransom reveals the cat and mouse games employed to bring a hostage out alive.

Across the globe, tensions are rising as North Korea flaunts its growing missile capability and nuclear weapons program. The North Korean leader, Kim Jong-un, shows no sign of backing away from this high stakes game, prompting many to ask what's motivating him. Kim Jong-un was only in his 20s when he was installed as North Korea's leader, but holding onto power was not guaranteed. In this BBC film, the program traces Kim Jong-un's rise to power and the lengths he's gone to, to shore up his position, from aggressively pursuing a nuclear weapons program to eliminating potential rivals. In February this year the North Korean dictator's half-brother Kim Jong-nam was assassinated in Malaysia at Kuala Lumpur airport. The brazen murder, with the chemical weapon, VX, was like something out of a spy novel but behind the tabloid headlines, it revealed a frightening capacity. In interviews with former members of the North Korean regime, former intelligence officers and friends of Kim Jong-nam, the program examines why he was such a threat to his half-brother. This investigation also sheds light on North Korea's secret international business network which is helping to fund the regime.

There's nothing subtle about the Gold Coast, from its towering sky scrapers to its bikini-clad meter maids. The glitter strip, famed for its stunning beaches, theme parks and nightlife is marketed as Australia's endless playground. Along with the tourists, developers are welcomed with open arms. There's barely a metre of land that hasn't been built on or earmarked for change in the holiday mecca. The larger than life Gold Coast mayor, Ferrari-driving Tom Tate, is famous for his crash through style and build them big vision. But in this pro-development town, a series of controversial billion-dollar proposals has prompted a collection of unlikely allies to come together to say enough is enough. On Monday, Four Corners investigates how deals are being done on the Gold Coast and whether developer donations are influencing decision making. Critics say crucial decisions are being made without proper scrutiny or consultation. And warn that the public isn't being told the whole truth about massive proposals which will have a lasting impact on one of Australia's most important tourist destinations.

Across Australia, governments, councils and the building industry are grappling with a problem so large, it almost defies belief. Residential buildings, hospitals, shopping centres and commercial buildings, have been built with flammable aluminium cladding, posing a potentially serious fire risk. It took the catastrophic Grenfell Tower fire in London, which claimed at least 80 lives, to set off alarm bells here, but as Four Corners will reveal, the danger posed by this cladding should not have come as a surprise. On Monday, Four Corners investigates why huge amounts of this aluminium cladding has been installed on so many of our buildings, and whether a desire to cut costs won out over caution. Insiders say there has been a colossal failure of regulation and oversight. With access to the tests now under way on suspect aluminium cladding, we reveal the enormity of the problem facing authorities and ask who will pay to remove and replace it.

Giving blood is a simple and selfless act that saves lives. For many, it's a way of giving back to the community, expecting nothing in return. In Australia, blood donors receive a drink, a biscuit and heartfelt thanks. Overseas, it's a different story. In other countries, blood has become a lucrative commodity fuelling a global trade worth billions of dollars. Plasma, the vital blood component used by pharmaceutical companies to create expensive therapeutic drugs, is like liquid gold. Plasma donation centres operate across America, where they pay, or "compensate" those who provide their blood. Many of these centres operate in the poorest neighbourhoods, where would-be "donors" queue to provide their blood and receive their payment. For some, their blood has become a vital source of income. This joint Swiss/French film investigates the impact of the plasma trade and the toll it's taking on those giving up their blood for money.

The statistics are startling. Australians are carrying more personal debt than ever before. For every one dollar earned, on average, Australians have nearly two dollars of debt. We hold the dubious position of having the second highest level of household debt in the world. Much of this stems from our obsession with buying real estate. On Monday, Four Corners investigates the forces driving our debt fuelled housing boom and the risks it poses for the nation. The program draws together key experts to map the danger zones in the housing market and will reveal the Australian suburbs currently experiencing the highest levels of mortgage stress. Experts are warning that a wave of home owners and property investors will be unable to cope if there's an increase in interest rates or a change in their personal circumstances. Regulators have been tightening the screws on lending requirements but there are concerns it's too little too late. The program investigates the lending practices that have driven the boom in residential lending, and asks, 10 years on from the global financial crisis, if the banks are prepared for a potential crash landing.

In a world awash with bogus news, dubious sources and noisy opinions, Stan Grant brings Australian audiences the essential context they need to separate facts from fiction on the important issues of the day.

Councils 'Will Scrap Recycling' The emerging crisis caused by China's decision to stop accepting waste for recycling will only get worse if no domestic solution is found, with more councils expected to scrap their recycling programs. Did Downer Meet Trump Campaigner Papadopoulos? Australia's high commissioner to the UK, Alexander Downer, joins 7.30 to discuss George Papadopoulos, Australia's chances of becoming a republic and Tony Abbott. Was Government Too Slow on Banking Royal Commission? For 18 months the Turnbull Government resisted calls for a banking royal commission on the basis that it wouldn't reveal anything new. Just a few weeks into the hearings, even the most hardened critics of the finance industry confess they're been surprised by the revelations. And that's creating problems for the Government about whether it was too slow to act. Australian Nun Faces Deportation from Philippines Philippines President Rodrigo Duterte has threatened to deport a 71-year-old Australian nun for "illegal political activity". He's accused Sister Patricia Fox of being an "undesirable alien", apparently for her work with the poor and oppressed.

Panellists: Andrew Leigh, shadow assistant treasurer; Fiona Nash, former Nationals senator; Rebecca Huntley, social researcher and writer; Jill Sheppard, lecturer, Australian National University; and John Roskam, executive director, Institute of Public Affairs.

There are millions of dollars being made in the Australian marijuana business but these entrepreneurs and investors aren't risking jail to make their fortunes. They're betting big on the home grown medicinal marijuana industry and riding the "pot stock" boom.

The Behind the News team reports on concerns about the number of anterior cruciate ligament injuries amongst school children; meet the high school students studying the waters around Tasmania's Mariah Island as part of a course in marine biology; plus a wrap-up of the day's news.

Back in the '70s, Australia fell in love with Susan Hannaford - Kitty in the hugely successful TV series, The Sullivans. A lot has changed since then. Hannaford fell in love with the idea of fame and fortune, reinventing herself as an American property tycoon. She has created a bizarre world of her own, where she's certainly the most famous inhabitant. But how much is legal, or even real?

Deadly Danger The problem with the word influenza is its misappropriated meaning. We get a cough or cold and then wrongly moan that we've got the flu. It's a mistake which means we don't take the real flu seriously enough, even though last year it killed 1100 Australians and put another 30,000 in hospital. It's a deadly danger but there is some good news. On assignment for 60 Minutes, Karl Stefanovic reports how scientists are working on a super vaccine to beat the different and often mutating strains of the virus. It is hoped that the new vaccine will be much more effective and longer lasting than the current annual flu jab. In the meantime, Australians need to do all they can to avoid the flu. On the Brink There is no diplomatic way of saying it: Russia and the West are heading to war. Last week's US-led airstrikes on Syria infuriated Moscow. But last month the West was equally enraged at the attempted assassination of a former Russian spy in the UK, using a nerve agent. That incident caused farcical tit-for-tat expulsions of Russian and Western diplomats in nearly 30 countries. So far no leaders are willing to blink or back down, but they do want to be heard. Vladimir Putin's man in Canberra, ambassador Grigory Logvinov, warns that Australia's blind support of Russia's enemies is helping to bring the world closer to global nuclear conflict. Being Barry Forget housewife superstar Dame Edna Everage and cultural attache Sir Les Patterson, Barry Humphries has another extraordinary character to add to his act. Himself. After 60 years of revealing his genius through others, audiences will now get to know the real Barry Humphries. And in a career as successful as his there's plenty to know, including how his demons almost destroyed him. But as Barry tells Liz Hayes in a candid and sometimes naughty interview, nothing can beat his addiction to making people laugh.

The Last Charge On a hillside near Bathurst, sculptor Harrie Fasher has created a striking memorial to the Australian Light Horse and the last great cavalry charge at Beersheba. Hero Dirt Five years ago the old tin-mining town of Derby was a ghost town. But a move to construct some mountain bike trails helped trigger an economic revival. The town is now booming and has been transformed into a world-class biking destination. Au Naturel Fish bladders, bone marrow and milk protein are just some of the animal-derived agents that might be incorporated in the winemaking process. As demand for animal-friendly products increases, so too are the number of wineries using alternative production methods to create vegan wine.

Barrie Cassidy presents Australia's most popular political program. We interview the key players, providing analysis, opinion and robust debate from the country's leading political commentators.

The Behind the News team reports on a lawsuit against the Royal Australian Mint, which has been accused of infringing the Royal Canadian Mint's patent on a coin colouring process to create its Possum Magic limited edition coins; visit Argentina's first sustainable school, built from traditional and recycled products; plus a wrap-up of the day's news.

In a world awash with bogus news, dubious sources and noisy opinions, Stan Grant brings Australian audiences the essential context they need to separate facts from fiction on the important issues of the day.

The Behind the News team reports on new research on the effect of the 2016 heatwave that caused coral bleaching on the Great Barrier Reef, which was worse than previously thought; learn why the Ipswich City Council has decided to stop its recycling program amid China's decision to stop importing Australia's recyclables; meet the young girls learning to take over their family's sugar cane farm; plus a wrap-up of the day's news.

James Comey interview Former FBI chief James Comey talks to Leigh Sales about Donald Trump, Hillary Clinton, Russian interference and the FBI investigations.

On a secret mission to kidnap a Nazi ocelot rumoured to know the codes to a submarine, a team of British commandos parachute into Berlin Zoo behind enemy lions.

In a world awash with bogus news, dubious sources and noisy opinions, Stan Grant brings Australian audiences the essential context they need to separate facts from fiction on the important issues of the day.

Indigenous Runner Takes on Boston Marathon Zibeon Fielding has gone from the red dirt of Mimili in outback Australia to the cold wet streets of the US to compete in the gruelling Boston Marathon. Part of former champion Robet De Castella's Indigenous Marathon Foundation, he's running to raise money for diabetes sufferers in his community - and be a role model for his young daughter. Irwin to Receive Star On The Hollywood Walk Of Fame The Crocodile Hunter, Steve Irwin, died 12 years ago. Now he's getting a star on Hollywood's Walk of Fame. Terri Irwin reflects on her husband's legacy. Former FBI Boss Questions if Trump is Fit for Office Leigh Sales talks about the reaction to James Comey's book covering his dealings with Donald Trump, as she prepares to interview the former FBI chief. A Regional WA Town Fighting Back Against Ice Barely a week goes by without another expose of hopeless addiction and lives destroyed by the drug ice. But in regional WA, where consumption of the drug is almost double the national average, one community is fighting back. Former addicts and their families are behind a push to get more users into rehab. AMP Customers Charged for Financial Advice Never Received One of the country's oldest and most trusted financial institutions charged thousands of customers for nothing, misled the corporate regulator and them tried to cover it up. AMP is the first financial institution to be questioned by the banking Royal Commission over the fee-for-no-service scandal.

The Behind the News team reports on the Greens' campaign to get the Great Australian Bite onto UNESCO's World Heritage list, to protect the unique animals that live there; meet five little penguins as they're returned to the wild after being rehabilitated by Taronga Zoo; plus a wrap-up of the day's news and sports results.

Chinese New Year isn't just a holiday - it's the largest annual human migration on Earth. We follow two workers as they travel across the country to their home town, the only time all year they'll see their children.

Meet Australia's Oldest Surf Life Saver For seven decades, Bruce Robertson has kept watch over generations of beach swimmers - he's Australia's oldest surf life saver. But at the age of 87, he's now too old to drive himself to the beach. Greens Call for Cannabis Legalisation Greens leader Richard Di Natale is leading a push to legalise recreational cannabis in Australia. Survivor Describes Rebuilding Life After Deadly Plane Crash After a plane crash in Indonesia left her with shocking injuries and killed 21 others, Australian journalist Cynthia Banham says it took her years to rebuild her life. Haven't Had a Wage Rise in a While? You're Not Alone Wage growth in Australia is at historic lows. While wage earners find it harder to make ends meet, the issue has become a political headache for the Turnbull government. But some economists argue that stagnant wages are actually driving an employment boom.

The Behind the News team reports on the conservation program to save Australia's critically endangered orange-bellied parrot, where only 50 birds survived in the wild before 15 more were released recently; learn about the growth of Australian rules football in Australia as young Sandy Bay Football Club player Maisie explains what she likes about the sport and the AFLW; plus a wrap-up of the day's news and sports results.

Andrew Denton sits opposite a range of fascinating people and try to find out what makes them tick. Guests include Cate and Bronte Campbell, plus Robert Plant.

Musical Talent Runs in Bradman Family Greta Bradman, Sir Donald Bradman's granddaughter, is one of Australia's most celebrated opera singers. And as 7.30's Mon Schafter found out, musical talent runs in the family. Our Recycling Could Soon be Headed for Landfill Australia's recycling system has been thrown into crisis, with the very real possibility that some of our recyclable waste could soon be headed for landfill. Port Augusta Power Station Clean-up 'Taking Too Long' The clean-up of decommissioned coal-fired power stations is a new challenge for Australia, and one regional South Australian community says it's being denied clean air because of problems with remediation. Will US-led Strike on Syria Make Difference? Just over a week after a suspected poison gas attack, the heart of Syria's chemical weapons program lies in ruins, according to the US military, after the UK and France joined a US-led missile strike. Military analyst Justin Bronk joins 7.30 from London to discuss what happened.

In a world awash with bogus news, dubious sources and noisy opinions, Stan Grant brings Australian audiences the essential context they need to separate facts from fiction on the important issues of the day.

The Behind the News team reports on the controversial end to the Gold Coast 2018 Commonwealth Games, where the arrival of the athletes at the closing ceremony wasn't televised; see how food charities are helping to feed children who are arriving at school hungry, amid Food Bank research that 18 percent of children miss breakfast once a week; plus a wrap-up of the day's news and sports results.

Panellists: Mitch Fifield, minister for communications; Amanda Rishworth, shadow minister for veterans affairs and defence personnel; Missy Higgins, Australian singer-songwriter; Kenneth Roth, international director of Human Rights Watch; and Grahame Morris, political strategist.