Jason Price brought in samples of drugstore beetles infesting a bathroom in a house in Valley Springs, Calaveras County, California. This is unusual, indicating a food source in that area. The problem started, to my knowledge, at least in May of 2020.
It turns out that this house had a bad mouse infestation in the rent past (prior to the new owners), and we are now going to search for rodent bait or a rodent cache in this area, beneath or within the wall there.
22 June 2020.