When I joined a big American company, on the first day on the job I was handed a thick set of documents, the most important of which was the employee handbook.
The handbook included 50 pages of rules and procedures. At the very top was the rule that if I was caught with drugs or alcohol on company property, I’d be automatically terminated.
I understood the logic — besides the engineering and sales offices, we were a factory. And being under the influence of alcohol or drugs was dangerous when you were operating a 30 ton injection molding machine. Or a forklift.