I use d-Con to help control the deer mice wintering in my garage since I am away so much. In the spring I have to literally dress like a haz-mat responder to clean out their pee and feces as exposure could trigger hanta-virus which is almost always 100% fatal.
I just insert the sticky traps in the attic and leave ‘em there for a couple months. Each time I check there’s something there that looks like it was once a rodent... but am not sure.