Dr Bill, thanks for your insight and information with regards to HDT. Here is my scenario, please give me your thoughts. 3 days ago, which turned out to be the exact 90 day mark after ingesting cocaine, my hair was harvested for an HDT. The quality of the cocaine was fair at best and the amount consumed was over a two day period and about 1/2 a gram or so. Prior to that I had not ingested cocaine in over three years. The hair was clipped about and 1/8 of an inch from the scalp in 3 different locations on my head. You have mentioned in other posts that infrequent use of many drugs is generally undetectable with HDT. Does that mean "zero" drug/metabolites will be detected or that the amount detected would fall below a certain threshold? The lab that is testing my hair has thresholds at 150 and 300. I'm not sure which they are using for my test. Like many people reaching out to you for answers, I too am freaking out. I know that my hair will test positive for Benzos, but have a prescription for those and do not take more than prescribed. I look forward to your reply. Kind Regards...