Is it legal for police to park in front of bars?

First off, I dont wanna hear the crap of, well dont drink and drive and you wont have a problem. I was pulled over with 2 beers in my system that i drank in 2.5 hours. NOT DRUNK, but a police man pulled me over because I "accelerated to quickly"! but he was parked in an alley thats posted "NO PARKING AT ANYTIME" right in front of a bar; poaching. Is this legal for them to do this in CA? By the way, its IMPOSSIBLE for my old truck to accelerate quick in anyway that dosent involve a cliff.