I test your pee for all kinds of drugs. Ask a drugtester almost anything.
I work for a major clinical laboratory company which handles many thousands of unique urine, blood, and oral samples a day. We test for almost every recreational drug, as well as additional testing to make sure you haven't altered the sample. Most of our samples come from pre-employment screening, but we also have hospital, law enforcement, and military clients. The next time you pee in a cup, it's probably coming to me. Because I value my job, I will not reveal which of the several drug-testing companies I work for, but you can ask me almost anything. I will post proof to the moderators.