ORIGINAL: NorthPA

I think the "trepass" thing concerns some folks. Don't quote me on this but I believe PGC can go onto private, even posted, property if they merely suspect a violation. It could even be that a search warrant is not needed to investigate probable cause.
Like I said, I don't know the specifics but some have rather convincingly recounted such things.
It doesn't take much to imagine a private landowner could post his land, bait game, take game out of season, exceed bag limits and if law enforcement personnel were prevented form going on his land, he'd never get prosecuted. Unless, of course, somoeone ratted him or he bragged etc.
Kind of like a state cop. They don't need to stay out of your driveway if they are following up on a report or even have questions. If they pull you over, ore even stop while you are parked, I think they they can search your car without a warrant on probable cause.
Send in the legal beagles.