Just in case anyone wasn't fully aware of the implications, consider what happened to Alain Baxter, the Scottish skiier who was stripped of his bronze medal at the Winter Olympics in 2002, and banned from subsequent events, when he tested positive for methamphetamine.
The source of this was a Vicks inhaler, purchased in the US, which contains Levmethamphetamine, whereas the version sold in the UK does not contain it. Despite the fact that as an l-methamphetamine it does not have the same performance-enhancing effect as d-methamphetamines, and an isomer separation test (not covered in the IOC rules) on the failed sample would have revealed the difference, the IOC upheld the disqualification.
Still feel comfortable with drugs testing?