Yeah, it might be a safe bet that they might have been party people, even at their age.
A bag of marijuana and a "small amount of white powder", which of course could also have been brought into the house after the fact by others...
There's the matter of the mattress tags, though. How do we know all the mattresses in that house still had all the tags that they came with?
Dennis and Rhogena need to prove that they didn't do anything to those matt-
Oh, wait.
Never mind.
Notice that more than enough time has gone by, for there to have been lab analysis of the "white powder". But no announcement.