It depends on where you are working. I know of at least one state where certain employees are given "comprehensive" drug tests depending on the job description, while the majority are just tested for the recreational drugs---pot, opioids, benzodiazepenes, etc.
You should be able to get access to all state mandated employee drug testing programs, with specifics on the drugs being tested for. All you have to do is ask---its your right as someone who is being drug tested to ask what you are being tested for. You should have no negative effects from that question as long as you comply with testing.