Apologies for not replying sooner. Drug tests are wildly inaccurate, certain compounds will produce metabolites that will cause a test to give false positives. I once tested positive for amphetamine but had used no amphetamine at all, seems methiopropamine produces similar metabolites as amphetamine.
I’m no expert in hair analysis but I believe it can be used to tell what has been used and roughly when. One thing I know for certain is that no hair test can say how much was used, only what was used. They can’t show exactly when they were used but they cangive an estimate with about a 10 day either side margin of error.
