Technically I wasn't drink driving. The night before I had a fair bit to drink and went to sleep at around 3. Woke up at 8 and drove him and got pulled over for a breathalizer. They could see I obviously wasn't drunk but I didn't realize alcohol stayed in your system for that long?

How long should I wait before driving if this happens again?

It clears out of your system in 24 hours

ya, I had to move my car one time in front of a meter cop early morning after drinking a few drinks. I had passed out for like 8 hrs, and still reaked of alcohol.

Lucky the cop didn't smell it.

What tipped him off to breathalyze you? Smell?

Sucks man, one of the rare instances I could say you were unfortunately "drunk driving" and the cops shouldn't have done anything about it.