Most drug testing is carried out by sending a candidate to the sample collection site, where urine sample is collected and samples are transported to a qualified laboratory for examination. Negative results will be reported within 24 hours. Test can be carried out even with instant test kits which are available on the market. Although kit tests are considered as accurate for instant screening, they are ineffective in the case of a positive result, because that requires laboratory verification and preservation of a sample for retesting is important. Continue reading