+22 Is A Dot Drug Test Urine Or Hair 2023. Hair testing is considered to be more accurate than urine testing because it can detect drug use. Marijuana metabolites / thc, cocaine metabolites,.
However, hair samples may also be used in certain. Web to comply with the dot regulations, a preemployment drug test must screen for marijuana, cocaine, opioids, amphetamines (methamphetamines and mdma),. Currently, dot drug testing is conducted through urine samples.
