Below is the description, by one of George Bush’s Justice Department lawyers, of insect usage in torture. The description is from page 3 of the 18 page Bybee memo (which you can read in full at the ACLU website here):
You would like to place Zubaydah in a cramped confinement with an insect. You have informed us that he appears to have a fear of insects. In particular, you would like to tell Zubaydah that you intend to place a stinging insect into the box with him. You would, however, place a harmless insect in the box. You have orally informed us that you would in fact place a harmless insect in the box. You have orally informed us that you would in fact place a harmless insect such as a caterpillar in the box with him.
Prometheus Unbound 