>>191
これじゃあ「ある」なんて言えないわなｗ

Roadside drug tests for cannabis return false results, research finds
https://www.abc.net.au/news/2019-09-12/police-roadside-cannabis-drug-testing-devices-questioned/11502436

Saliva test for cannabis could someday help identify impaired drivers
https://www.sciencedaily.com/releases/2020/03/200330152114.htm