Originally Posted by MikeyMK

It's not your problem.

It's not for you to tell someone how to wipe their arse.

Incidentally... Here, if you bring four beers and drink them over the course of six hours, you're probably under the limit when you drive home. If you stay a couple hours before driving, you're good for a fifth.

Personally i think any alcohol before driving is a daft idea, and it's playing with fire. But the biggest problem is that it can bite you even if you're under the limit - if anything happens, if it's someone else's fault, and you're under the limit, the local press and social media will still say you had 'drank alcohol'.