A cocaine test can happen when you get a new job or have to have one to continue employment. This is one drug that they look for when they take a sample from you, with urine being the most common way of collecting one to test.They do not test for cocaine as such, but for benzoylecgonine. This is cocaine that has been metabolized in the system and the remains for which they look for to fail you in the test. It does not matter if it is cocaine or crack, this is what appears.Cocaine drug testing can give you a positive, even if you have no done the substance for several days. This is because the concentrates in the urine can change throughout the day, and like a pregnancy test, can be higher in the first urine of the day. This is not always true, however, since the length of time you have used...