There's always these things--
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As to poison- most of our recreation toys reside at our favorite boat harbor, and every kind of varmint known to man does too. Nothing more fun than hearing wife yell 'OMG there's a mouse under the pillow!' in the motorhome or houseboat. So for the past 13 years I've routinely laid out mouse blocks, in the lower compartments of the boats and motorhome, and on the ground around where they're parked on the hard. A few things I've noticed:
-- they must taste like candy to mice because they're never around long, and more than once they've eaten thru sealed bags to get at them-
--blocks on the ground or under the boat dock DO keep the mice out of the rigs, for the most part--
-- when I find dead mice inside (my house too btw), they're always right in the middle of the floor, not hiding along or inside walls, but right in the wide open, as if they were hoping someone would help them.
-- at the harbor there's scads of feral cats running around, Never have I seen one that got sick or died. For that matter, I've never seen ANY sick or dead animals, including mice, around the harbor, and I go thru a lot of mouse blocks. At home I just make sure to put them where pets can't get to them. Never lost a neighbor's cat either, to my knowledge.