How to convict sneaky behavior you didn't see
I have a question- how do you convict/handle sneaky behavior that you don't actually witness? Example... we have a salt dish and a sugar dish... SOMEHOW the salt ended up in the sugar dish... sugar ended up in the salt dish. Innocent prank- not a big deal- but we would like to get to the bottom of this... Now DH wouldn't do that... I didn't do it...and DD(21months) didn't do it. That leaves one person- SS13. We asked him about it and he denied it to the point of tears. It turned into a 1 hour discussion becuase the kid just wouldn't fess up to it. Unless we have a ghost- this kid switched the salt and sugar and SS still hasn't owned it.
Another example- the egg. DD has a play structure in our back yard. *Someone* burried a chicken egg beneath the mulch at the end of the slide so that when DD came down the slide- she would land on the egg. I didn't do it. DH didn't do it. In my mind- that leaves one person. DH was like, "well, it could have been the neighbor, or an animal... we can't say it was SS for sure becuase we didn't see it." Bullshit. Our neighbors never go in our yard and an animal wouldn't strategially bury a chickens egg right at the bottom of DD's slide. DH plans to talk to SS about this- but he doesn't feel comfortable saying it was him because he didn't witness it. I am livid.
Now I know people will say nanny cams... DH and I just got a small one for our bedroom that we will turn on when we know SS will be home alone for an hour or so after school. Today is the first day of it- so I will learn if SS is sneaking into our bedroom. The problem is DH doesn't feel comfortable putting cameras all over our house. I'm paranoid that he's trying to mess with my or DD's tooth brushes, etc. I don't want to put a nanny cam in the bathroom- that doesn't feel right.
Bottom line- I don't trust this kid. He is a sneak, he lies, and he has ZERO accountability. DH doesn't feel comfortable convicting him because he didn't actually witness SS's in the act. What do I do?!