I would add, when using screen mesh on a cricket enclosure, make sure that it is aluminium and not nylon. They can chew threw nylon.

Also, this past week I had a massive cricket escape, several hundred. I have been rounding them up and throwing them back in the bins or feeding them to the rococo toad. I wouldn't worry about them picking up any toxins in your house unless you have an open container or rat poison or something similar lying around.