How could maintenence personnel have probable cause to look through people's things?
The same way anyone else could have probable cause to look further, I never said anything about it being legal
If I knew a maintenence person looked through my things I would demand immediately to the landlord that that employee be terminated. I would tell them that if they wanted to look through my things then they better call the police and have them acquire a search warrant.
First you have to catch them, and they do this for a living day in and day out
I could see them having the right to alert LE personnel if they see something suspicious but maintenece workers don't have the right to determine probable cause and look through people's things. Even if a LEO saw something suspicious he/she wouldn't have the right to act on it if he/she wasn't authorized to be in the residence. Any evidence brought to court without a warrant would be dismissed. That is for LE personnel while maintenence crews don't have the right to be making accusations period.
Get off the legal aspect of it. Probable cause is not always a LEO term. No one is going to take nekid pictures of your girlfriend or your stash of nudie mags to court.
I did this work for over twenty years if you think that you can stop maintenance from snooping around your place when they're bored just because you can spout legalities you are living in fantasy land.
It has slowed down a lot since nanny cams became cheap enough for regulars people to afford, but it still goes on
There was a case in Florida where a pest control worker was enjoying the tenants porn collection while they were away.
They caught him on nanny cam doing that thing that all men do and deny doing while watching and used some of the wifes unmentionables afterwards and put them back in the draw when he was done.
He was prosecuted the company was sued and the industry suffered a black eye after it was show over and over on the local news.
He wasn't the first or last caught committing indiscretions
My point is maintenance snoops , sometimes at the request of management, accept it and act accordingly