Crack down on pot users, obviously.
Or, seize someone’s assets....
Total Kabuki that is, each state can decide as they have what if any penalty there is for possession. In Colorado and other states who have done so there is no override to stop a company firing you for testing dirty
It is ridiculous to put it in the same tier as Heroin on the drug schedule, just keeps agents employed as it did post prohibition when alcohol was made legal again
...and seize their assets