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Lance Armstrong has revealed that he relied on the short lifespan of performance-enhancing drugs in the bloodstream to avoid detection by anti-doping testers during his cycling career.
Armstrong, now 52, faced a downfall in 2012 when he was stripped of his seven Tour de France victories and received a lifetime ban from cycling due to his involvement in systematic doping practices.
The former cycling champion admitted to using performance-enhancing drugs for years, maintaining a façade of denial and accusations until his public confession in a 2013 interview with Oprah Winfrey.
"You would foil the system," Armstrong told Bill Maher's Club Random podcast.
"What I always said, and I'm not trying to justify what I said as something I would want to repeat again, but one of the lines was, 'I've been tested 500 times and I've never failed a drug test'.
"That's not a lie. That's the truth. There was no way around the test. When I pissed in the cup and they tested the piss in the cup, it passed.
"Now, the reality and the truth of all of this is, some of these substances, primarily the one that is the most beneficial, has a four-hour half-life. So certain substances, whether it be cannabis or anabolics, or whatever, have much longer half-lives.
"You could smoke that joint and go to work driving your tractor [and] in two weeks test positive, because the half-life is much longer.
"With EPO, which was the rocket fuel that changed not just our sport but every endurance sport, you have a four-hour half-life, so it leaves the body very quickly. With a four-hour half-life, you can just do the math."