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The information on this page is from my own personal experience and has worked for me every time I have been drug screened. I see a probation officer monthly, and was recently tested positive for marijuana. Now I have to attend substance abuse classes three times per week and have to submit to drug screens one, two and sometimes all three days.
The drug screens are done by testing my urine and they are ALWAYS monitered by a police officer. The little plastic cup I pee in has a built in thermometer to test the temperature of the urine. Once I've submitted my sample, the officer then uses a single panal, double panal or triple panal testing kit which is placed into my urine and renders the results in less than five minutes.