Wow Luke that's crazy shit. Talk about the long arm of the law. FFS a random swab with no signs of impairment. What a world we live in.Yes.
They do a tongue scrape, if that comes up positive then you get a saliva swab. If that comes up positive you are charged for Driving under the influence of drugs. If the swab comes up negative then the swab is sent away for a more detailed analyst and if its positive at the lab then your charged.