I was thinking urinalysis, which I was always told was ~30 days. It doesn't change the argument.
C-level or anyone in the company exempt? Do we monitor alcohol usage so closely? Would people tolerate it if we did? Federal law is the only reasonable basis for an employer to be testing for off the clock use of a drug that is legal or decriminalized in that state. Otherwise it's an invasion of privacy. And yes, it is, whether you tell me it legally is or not.