Additionally to this, there are a hell of a lot of nerve endings in the palm of your hand. Very dangerous.
I've also noticed a lot of spook tests revolve around incorrect metagaming. God forbid a character is pale, goth, or both. I've seen people stalk the forums and view dark MA,CA,FA, or TAs to know which persona holds it. There was a time when Haelun'or posted an article with metagamed (false) evidence of characters being darkspawn, and even though it was taken down at request, paladins still showed up and held my character hostage with the same taken down evidence as grounds that my character was darkspawn (which she wasn't lol).
All and all, I agree with most people when they say aurum testing itself isn't bad, it's just being abused and used lazily