Are you sure?
"In the US a search warrant must specify the types of items that are being searched for, not a blanket "everything in this address". Since this was presumably a search for computers, electronic records, etc., any LSD and ecstasy found is inadmissible ....."
So if the police come in looking for hacking material and find you in bed hard at it with a couple of 10 year olds, you can't be arrested for that?
Or the police come in looking for guns and find 3 tonnes of crack coccaine, you can't be done for that?
I find that VERY hard to believe.
I would hazard a guess the actually law is they can't say, "We are looking for illegal items", however if in the search for specified items, they find other illegal items, you can be arrested for that on a seperate charge.
I know America is pretty fucked up, but I don't think it's that far gone.