The consumption of psychostimulant substances goes through different stages, it is important to note that the phases do not have to be consecutive. Drug use usually begins by experimenting. The vast majority does not pass this phase of experimentation. However, it can continue towards sporadic consumption, more habitual consumption, until finally reaching dependency. This escalation of consumption can be stopped at any stage and may vary from one drug to another.
There are different types of drug tests and all are used for the same purpose: to detect drug users. Depending on the type of test, a biological sample (urine, blood, saliva, sweat or hair) is analyzed to detect the presence of drugs in the metabolism.