Following this analysis, you definitely need more time for get rid of two pints, don't you?
This is where this alternative "ad" settles.
Watch the video, it's explained there.
I have a feeling this method of proving someone drank too much is not really precise, but safety first.
It's for a good reason that you are not allowed to drive while having more than 0.5 mg blood alcohol.
Nevertheless, I think they could have optimized the way the information is presented after pissing on the black thing. All the guys have to crouch to be able to read what it says; you don't feel great going prone in front of an urinal, do you. Actually, I have no idea if and how it is possible to display the information you probably drank too much and better take a cab in another way, but it would be worth spending a thought for it, indeed.