Alot of these medical test are great but I think this one is begging for someone to abuse it. Someone could claim they were drugged and raped one day, then the next they could go take some GHB. If this got in as evidence in some rape case I hope they have more evidence to go along with it. If not, I don't see how evidence collected a month after the incident could survive a appeal.
Well, an accuser could have taken GHB before she got to the hospital. It would then have shown up on the urine and blood tests. So the possibility of a frame is there anyway even without the hair test.
I'd like to know the timing accuracy of the hair test.