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Micro-dosing doesn't eliminate detection, right?
That's a question of pharmacokinetics and the concentration which can be reliably detected in a lab without false positives. It's possible that there is a drug which is therapeutically useful at such small doses and is also either excreted or metabolised into innocuous metabolites so fast that it is effectively undetectable in tests after a period of only a few hours.
There's still a chance they can detect the drugs via normal tests though. Micro-dosing doesn't eliminate detection, right? I guess the docs know when and how much to give to ensure they're not still, what is it, "glowing"? How much chance is there of them failing to get that right I wonder?