when Jesse launched his never ending party with a houseful of meth heads and loud music, how did they got get busted by the cops.
The house is in a nice community. I can't see how there wouldn't be complaints from neighbors issued to the cops for noise and/or all the weird characters inhabiting and coming/going from the residence.
as soon as a cop looked in the door and say all those strung out people laying on the floor it'd be game over.
A few reasons:
1. Jesse still holds leverage over Hank, so the police may not want to go near him with a long stick.
2. Maybe complaints were made, but he only had to pay fines. He sure as hell had the money to spare at that point. I guess it probably never went too much further or the police probably would have discovered something, which would be strange, but not incredibly unlikely IMO.
3. Even then, music from Jesse's place is heard as distant and muddled even from outside his front door. Even if the neighbors could occasionally hear a bass thumping, unless their specifically bothered by the noise, they wouldn't have any reason to complain to the police. So my neighbor likes his music loud. Who cares? Only certain people would call the police for this unless they were being specifically aggravated, and there's no evidence that Jesse is bothering anyone.