The most commonly known drug test is the urine analysis. The urine tests can screen for amphetamines, barbiturates, benzodiazepines, cocaine, marijuana (commonly known as weed or pot), MDMA (commonly known as Ecstasy) and its metabolite, methadone, opiates, oxycodone, phencyclidine (PCP) and propoxyphene, synthetic cannabinoids (commonly known as "K2/Spice") and synthetic stimulants (commonly known as "Bath Salts"). The urine screens are a quick test; however, it only goes back, at most, a few days. If a judge orders this type of test, it is imperative that the test be taken as quickly as possible. Otherwise, the drug may be out of the other parent’s system and not show on the screening. Urine tests aren’t generally used if alcohol is thought to be the issue because alcohol passes so quickly through the body. Another issue with urine tests are that they are the easiest test to fake or produce a false negative. However, one benefit is that this type of test is generally the cheapest of the drug tests.