Your employer usually doesn't give a shit about booze, as it's legal.
Which has always behooved me. Luckily, when I was in the work-force, piss-testing was still unheard of. But company executroids usually throw down a few cocktails during lunch...then hit 'happy-hour' after work & get hammered. Come in the following morning all hung-dung...feeling like shit...but that seems to be OK with them.

When's the last time anyone missed work because they were too hungover from weed? NEVER!! Makes a lotta sense, doesn't it?