Unfortunately there exists no test that can determine a bodybuilder's detailed drug use in the far past, and doping test results are very easy to manipulate . Therefore, if you really want to know whether a bodybuilder is true natural, or which drugs he has been using to build his physique, you will have to ask him. The standard answer to this question is, however, always "No, I have never used any drugs". However, if you get to know the guy better, develop some friendship, give him some complements on his physique, and especially if he thinks that you are a drug user yourself or interested in becoming one, he might well loosen up and start telling you at least part of his true story.
Who was interviewed? Here's a very partial list: tech icons (founders of Facebook, Twitter, LinkedIn, Craigslist, Pinterest, Spotify, Salesforce, Dropbox, and more), Jimmy Fallon, Arianna Huffington, Brandon Stanton (Humans of New York), Lord Rabbi Jonathan Sacks, Ayaan Hirsi Ali, Ben Stiller, Maurice Ashley (first African-American Grandmaster of chess), Brené Brown (researcher and bestselling author), Rick Rubin (legendary music producer), Temple Grandin (animal behavior expert and autism activist), Franklin Leonard (The Black List), Dara Torres (12-time Olympic medalist in swimming), David Lynch (director), Kelly Slater (surfing legend), Bozoma Saint John (Beats/Apple/Uber), Lewis Cantley (famed cancer researcher), Maria Sharapova, Chris Anderson (curator of TED), Terry Crews, Greg Norman (golf icon), Vitalik Buterin (creator of Ethereum), and nearly 100 more. Check it all out by clicking here.