When you get past the ick factor and the jokes, bedbugs are a real problem for commercial properties like hotels and rental units. The legal issues alone are frightening.
The problem with bedbugs is that they hide from the light, so inspecting a room isn’t often going to reveal the things — they’re busy sleeping in the walls. (I know: Eew.)
Not surprisingly, with the necessity of dealing with the %$@&! bugs comes several inventions — companies that specialize in detecting and eradicating them.
There are devices that see through walls, traps that lure any bugs (and thus confirm an infestation), and even bug-sniffing dogs.
All this is covered by Commercial Source; click here to check it out.
And if you feel the urge, here’s Wikipedia on bed bugs.