Don't leave the envolupe out, get clothes put away. Who ever rented the room, throw on a robe, warm ups or sweats.
Smoke free rooms are a problem, especially weed. Duhh.
But NO admit nothing.
LE might have a right to enter with valid probable cause... ie, someone screaming like they were being attacked... trying to figure out which room thecry for help came from. But I would not let them past the door, see there's no one hurt here. LE would not have cause for a search.
Hotel Security / Management has more rights if they think that hotel policies are being broken like smoking in a non-smoking room. But that just gives them the right to charge you extra, not enter & search your rented room. So again, I'd not let them past the door.
Don't lock yourself out! If it was MY ROOM, I'd take my key & go out in the hall to speak to them. After giving Management a brief glimse through the door, I'd let the door close. If Management doesn't respect the privacy of it's customers, I'd not be going back. Preferably, I go back in my room & close the door.
I wonder if such incursions are attempts to inconvience providers / clients to discourage their use of the hotel. I bet there are providers in virtually every hotel... some wink at it. Others frown