The basis of the established mobile platforms are the sensors (magnetic sensors) sensitive to tetrahydrocannabinol (THC) — the substance found in the buds and leaves of cannabis.

Experts took three minutes to assemble with a cotton swab saliva samples, analyze them and display the results on the screen of the smartphone or laptop. According to scientists, the device not only detects THC, but also determines the concentration.

The authors describe the principle of operation of the tester. The saliva sample mixed with antibody — molecules that selectively connect with a particular substance (in this case THC), is placed on a disposable chip, is covered with sensors that are already associated with the molecules of tetrahydrocannabinol.

The more THC was in the saliva, the less free antibody available for binding to THC, which is on biosensors. The sensors detect the number, and the reader determines the content of the substance in the original sample.

According to scientists, the platform can be used to detect not only marijuana, but also morphine, heroin, cocaine and other drugs.