Scientists have found a simple method for determination of traces of marijuana in breath. They proposed the use of electrochemical oxidation of colorless THC in his hinnawy analog purple coloring. Article published in the journal Organic Letters.
For the evaluation of the UN, only in the last decade, the number of people who use marijuana has increased by 60 percent and reached the mark of 200 million people. Historically, marijuana in many countries is outlawed, but in recent years the authorities of some countries and regions (e.g. Canada, Spain, Chile, Netherlands, Australia and 11 States in the U.S.) partially or completely legalized the use of marijuana. Thus in these countries there is a need for control safe use — especially when driving a car. A recent study showedthat only in the US in 2017, 12 million people were prosecuted for driving under the influence of marijuana.
In marijuana there is more than a hundred different cannabinoids, although the greatest the greatest psychoactive effect has Δ9 — tetrahydrocannabinol (THC), the contents of which can vary between 5-30 per cent. The presence of check in the blood in current road tests, but assessment methods either are time consuming and require special training to analyze blood or saliva, either based on subjective evaluation of driver behavior to the police. Recently began to actively develop chemical methods for the determination — for example, scientists have demonstrated that the amount of THC in exhaled air is correlated with the time since the use of marijuana and THC concentration in the blood. Existing methods include: prolonged mass spectrometry, optical determination of the connection between THC and toxic reagent, and inaccurate electrochemical detection using carbon nanotubes.