Home drug tests can be found at most of your larger drugstores, like Walgreens, Rite-Aid and CVS right off the shelf. There are several combination’s of tests, one for marijuana, cocaine, heroin or methamphetamines. Each test usually contains one test kit for a particular drug. Some of the kits combine two drugs together, like marijuana and cocaine. They have become very reasonably priced in the last couple of years.