As reagent testing has become more popular, vendors have begun to offer a greater range of tests.  This increases the likelihood that a substance might have a unique profile of results, making the tests more useful.
Other reagents are discussed in scientific literature, but limited applications mean they may not be sold for consumer testing.
The National Institute of Justice provides information about "Color Test Reagents/Kits for Preliminary Identification
of Drugs of Abuse" in NIJ Standard–0604.01.
Several products are in early phases of development that are intended to allow their users to covertly detect (without using droppers, etc.) date-rape drugs, for instance reusable straws with components that change color in the presence of GHB, Rohypnol, or ketamine – see .