This is very interesting and both old and new info
Post# of 1481
Identification of Multiple Illicit Drugs Using a Handheld Detector Based on Chemiresistive Sensor Arrays:
"Next Dimension Technologies and Caltech will jointly develop a handheld detector to meet the Armys need for a field-based illicit drug identification system. The project will focus on the design and development of a dual-mode chemiresistive sensor array capable of detecting key drugs of interest, including synthetic cannabinoids and opioids..."
https://www.sbir.gov/sbirsearch/detail/1304151
https://www.sbir.gov/node/249174
https://www.mydxlife.com/wp-content/uploads/M...aper-1.pdf