> I'm not saying it's the most professional choice, but if I were about to burgle a courthouse as part of my work, I'd like a beer or two to calm my nerves beforehand.

This is a job where having impaired judgment is a terrible idea.

If someone needs alcohol to do a job that involves taking the role of a criminal and summoning the police, drinking alcohol before it is a terrible choice no matter how you look at it. If they can't do the job without alcohol, they shouldn't be doing the job at all. Maintaining unimpaired judgment is a baseline expectation for a job like this.