I'd imagine that's true on both counts, but with these things it's notoriously difficult to prove. You'd have to prove that the contractor knew about the damage, didn't do anything to mitigate it and then knowingly attempted to hide it. All of that is pretty tricky to pull off, given that a home damaged in this way might not show signs of the damage for a good while.
It's why bad actors (such as the ones described above) keep getting away with what they do.
Those are pretty easy to prove in this case. All you’d need to do is find, remove and test the bad dry wall. There’s no way someone installing it could reasonably claim ignorance of its condition.
You get one of the people who did the installation to admit to it. I'm sure you could find someone who has a conscience or doesn't think they are personally at fault who would be willing to own up to it.
Construction crews in Arizona? They aren’t going to own up to anything because a majority of those workers are in the country illegally. You aren’t going to find them going to depositions or signing affidavits any time soon. That isn’t mutually exclusive with “having a conscience” of course, but that does mean that you aren’t going to have much luck finding anyone who actually worked on that crew and if you did, they aren’t going to talk.
I can only speak for UK contractors/companies, but most of these guys will immediately close ranks on you if you try and pull this. The guys at the lower end of the chain won't want to say anything because it could affect their ability to get work at a later date. A lot of them are on temporary contracts, and these companies talk to each other. If they start making noise about these sorts of mistakes, they could well wind up on a blacklist.
