im currently taking random UA once a month. last month i decided to quit and got 10 days of beautiful sobriety before i caved. i had a drug screen on day 8 of that 10 day stretch and was dirty for fent. i had read something ab it sticking around in your muscles or fatty tissue or both i cant really recall but i found it to be kinda strange seeing as its half life n all. it just seemed odd that it had been above the threshhold of .25 mcg after being clean that amount of time and also that im a super active person. any and all insight wld be incredibly appreciated from you guys! ty!