First. I am a "former" user of methamphetamines. I am on probation. I've worked very hard to stay clean,and I'm proud I've come as far I have. My probation officer says I tested positive for amphetamines. I need to know what caused this. My only prescription is Biktarvy. I've taken Benadryl Daytime cold and flu OTC. I simply don't have a vast knowledge on the subject. I'm to trying gain this knowledge to help me stay clean,and be here for my grandchildren.