John Smart asked: One of the most popular way of drug testing is hair sample drug testing as it has the capacity to detect the presence of drug in the persons body whether or not the same person has used drugs in the past 3 months. It can detect all of the major types of drugs, including marijuana, opiates, methamphetamines, PCP, ecstasy, and cocaine. It can also trace the amounts of illicit substances trapped in the cortex of the hair. All this proves that exposure area is much larger in hair drug testing. Hair follicle drug testing gives the information of an individual's drug use history.Hair follicle drug testing is a great way to detect the presence of drug in the hair of an individual undergoing the test. The process is quite [+]