Sticky Insect Traps

A month or so ago, an extermination company came to our school and set out lots of those little sticky insect traps. There are four or five in my classroom - under a table, beside the outside door, behind bookshelves. To my knowledge, the company hasn't been back. Yesterday, as I walked around the room, I saw that every single trap is now solid black on the inside with insects trapped in the adhesive. From what I could see (without picking them up or getting too close), the culprits are mostly crickets. I'm sure there are other insects there, too, along with some spiders. It is SO gross!