Maybe. There's normal ones you don't need a blacklight for, but I'd rather not be trying to figure this out AFTER they show up.

[That was the situation he found himself in the first time and it was NOT FUN. Fret shrugs. Nothing happens to Emma's leg, the "tripwire" is literally just a UV Aquarium Sterilizer he stole from the lounge. Maybe her socks will glow a little if they're white.]

I'd set em' up in every room if I could, but it's probably better to just set up in a few places that can take a fight. Then you can just lead them into the trap - they're not intelligent.