The feds will still go after it as an illegal drug when presented as recreational and the will keep the stigma going on forever. Furthermore it will keep a lot of talented people out of good job opportunities for smoking a joint after work instead of having a glass of wine.
“the past 30 days”
So you literally don’t know how drug tests work? Marijuana clears an oral test in about a day, most jobs that test for it simply tell you to come back the next day. This is in legal state, and covers the vast majority of jobs. If you can’t be sober for a full 24-hrs before a pre-employment check you’re an addict. This would be like if someone admitted to being drunk the morning of an interview.
“Neither of those details speaks to sobriety at work”
Again you’re confused by the efficacy of drug tests. If you can’t be sober for 1 or 2 days to get your job that you applied for, it’s far less likely that you are going to be sober on the clock. (Few places do uranalysis, and I’ve literally never heard of a blood or hair test which are the ones that actually can reliably test that far back).
Strictly speaking you cannot prove that the person who shot heroin during your interview, is also going to do drugs on the clock. It is however a very good indicator that they are unprofessional, will be a bad employee and are quite likely to drugs on the clock. Companies don’t just spend thousands of dollars a year to be cruel to employees.