Here's an interesting tidbit: The tricky thing about THC, however, is that it is a large and complex molecule unlike ethanol, the main compound in alcohol, whi

Here's an interesting tidbit: The tricky thing about THC, however, is that it is a large and complex molecule unlike ethanol, the main compound in alcohol, which is relatively small and simple. According to Tom Bruno, a NIST research chemist and co-author of the new paper, the vapor pressure of the THC compound is “very, very low,” which makes it difficult to measure. Bruno, along with fellow NIST researcher and lead author Tara Lovestead, found a way to skirt around this issue by measuring THC vapor pressure with a vapor-capturing technique called PLOT-cryo. It works by trapping vapors in a solid substance that coats the inside of a small tube. Because the tube is so small, Bruno said, the process is very efficient. “You don’t have to collect a lot to get an analyzable result,” he remarked. The PLOT-cryo device works like a very sensitive nose. It can sniff out different compounds from the air, and has been previously used to identify explosives as well as decaying flesh. https://www.seeker.com/health/new-thc-finding-paves-the-way-toward-an-effective-marijuana-breathalyzer https://www.seeker.com/health/new-thc-finding-paves-the-way-...