The practice of testing for the presence of banned or illegal substances has been around for some time now and is usually conducted by professionals and laboratories that specializes in testing for drug abuse.

Drug abuse testing is mandatory by law for many jobs and professions such as commercial drivers, law enforcement and other emergency personnel and required by most employers and sports associations. The substances being tested for may not always be illegal. In the case of athletes, many performance enhancing drugs and/or steroids may also be screened for violation of rules, rather than laws.

There are two sides to the issue of drug abuse testing: safety of others and the invasion of one’s privacy. Many people feel that had our forefathers foreseen the technology to screen our blood and urine for the presence of chemicals, they would have included bodily fluids into the Fourth Amendment to the US Constitution; the right to be free of unreasonable searches and seizures.

Others see drug screening as a way to keep them safer. One example of this is that many people feel that it is legitimate to "invade our privacy" if it will keep truck drivers or forklift operators from operating potentially deadly equipment while under the influence of illegal drugs. Some people wish to work in an environment where they are not surrounded by other workers who use drugs, whether for safety reasons or personal preference.

In the world of sports, use of performance enhancing drugs undoubtedly gives an unfair advantage over other athletes who do not use steroids or other performance boosting agents. Drug testing is therefore used by athletic associations to keep the players honest and within the guidelines allowed.

When drug abuse testing was first used, it was very easy to get false positive results from items that were similar to illegal drugs. Many people tested positive for heroin use just from taking over the counter pain relievers such as Motrin. Poppy seeds were another common ingredient that gave false positive results. Over the years, the tests have become more refined; designed to screen out potential products or foods that could give a positive reading and possibly deny a person employment or worse yet, show drugs in their system after a fatal accident involving a commercial vehicle, where testing for the presence of illegal drugs is required by law.

In addition to the many labs and private companies that offer drug abuse testing on a commercial level, there are now home test kits available for parents who may suspect that their children may be using illegal drugs or for people who may be facing a commercial drug test for an upcoming job interview. Many people still feel that these tests are intrusive to their privacy and may elect to purchase a kit that allows them to "fool" the commercial test, and may use a home drug test kit one or more times prior to the actual test to ensure that they will appear clean when they go to the lab.