Either urine or oral fluid-based, “instant” tests can screen for only a few or for multiple substances, such as Marijuana and cocaine only to a full ten panel regime. Collection and results actually take about ten minutes to process. When combined with lab based GC/MS confirmation testing of prospective positives, their accuracy is about the same as their lab-based counterparts.
Care must be taken in the collection to insure that chain-of-custody documentation is complete and specimens are properly handled. When administered by agency personnel however, there is no professional component in the initial testing and no separation from the collectors and the testing agency, instant tests are often viewed as less evidentiary than lab-based testing or instant testing collected by third party certified collectors.