pulla said:
Steroids have different 'half lives', that is they are detectable for certain periods. The Stanolozol Ben Johnson used in 1988 is detectable for a considerable period of time, whereas Dianabol is out within a few hours. Not sure if a test has been developed for Human Growth Hormone yet, but a couple of years ago it wasn't testable. The THG Balco labs developed wasn't even known about by authorities until an anonymous person left a syringe of it at a testing agency a couple of years ago.
A good friend of mine who competed as a weightlifter at Commonwealth level (he's also a doctor) was always known to say you are only as good as your masking agent or the doctor prescribing/advising you. Food for thought there.
It's flawed logic, pulla, to say that in the absence of evidence, there is an indication of drug use.
Occam's Razor: what's the simplest possible explanation of someone testing negative?
1. He is not using drugs
2. He is using drugs and is masking them
It's not definitive, but in the absence of anything else, it makes more sense to assume he's negative