This episode of Four Corners screens a shortened version of the 2017 human rights documentary Complicit, directed by Heather White & Lynn Zhang.

Filmed over 3 years it investigates the Chinese workers paying the price for our mobile phone obsession.

"There were iPhone screens and Nokia screens…I held the phone screen in my left hand, and a piece of cloth in my right hand… Wiping was the only thing I did besides eating and sleeping." Teenage worker

Mobile phones, smartphones and tablets have revolutionised the way we communicate but the technology we are addicted to has had toxic consequences.

"I knew we worked with chemicals, but I had no idea that it's poison." Young worker

China produces approximately 90% of the world's consumer electronics. The factories making the components for these electronic goods are filled with young workers. Some have been exposed to poisonous chemicals, with devastating results.

"Many co-workers developed the exact same symptoms. When I walked, it looked like I had uneven legs. It would take 10 minutes to take a two-minute walk. My legs felt too heavy to move." Worker

This investigation, filmed secretly over four years, exposed the use of harmful chemicals in the factories producing the products many of us use. Hidden cameras captured the working conditions inside the factories churning out these products.

"It was the cleaning solution he used, which contained benzene, when he was working at the electronics factory that caused his disease." Father of sick worker

The film charts the growing realisation amongst the workers that their illnesses stem from their work and follows their fight for compensation.

"After we discovered so many workers with leukemia…more media reports followed up and showed that these workers were chemically poisoned." Worker activist

The landmark investigation led Apple to ban the use of benzene, a known carcinogen, and n-hexane, a chemical that damages the nervous system.

But the ban does not apply to subcontractors who make up two-thirds of Apple's supply chain. And around 500 other chemicals are still used to produce electronics, mostly in the developing world, where there are few or no regulations to protect the workers who make them.

"Many of the workers that I've helped got occupational diseases due to exposure to toxic chemicals. Many are from the electronics industry. They made cell phones, computers, semiconductors etc." Worker activist

It's the story of the century: The US President and his connections to Russia.

In a Four Corners special series, award winning investigative reporter Sarah Ferguson follows the spies and the money trail from Washington, to London, to Moscow.

Months in the making, filmed across the United States, the United Kingdom and Russia, Sarah Ferguson charts the extraordinary allegations, interrogating the evidence and interviewing central characters in this unfolding story that could be lifted from the pages of a blockbuster spy novel.

In this three-part series, Four Corners delivers a riveting account of the allegations and evidence from the characters central to the drama that has gripped the world.

Part 1: Follow the Money: Four Corners follows the money trail from New York to Moscow, tracking the ties between Trump, his business empire and Russia.