Ah yes, the lovely psych test. I took one for a local department and was told that I didn't meet their "profile." When I asked WTF that meant, they said, "Sorry, we can't tell you." (I have since gone on to another department that hasn't yet figured out that I'm psychotic ;)).
I did some research on one of the tests given to me. It was called the "Minnesota Multiphasic Personality Inventory," or MMPI to its close friends, and came out sometime in the 1940's, IIRC. It has 566 mind-numbing, utterly irrelevant questions. Only the first 400 count; the rest are just fluff. There are four things they graph on the test, but I can only remember "Lie" and "Validity."
Some of the gems they ask include, "Evil spirits possess me at times," and, "I think I would like to do the work of a florist." One of the questions I still haven't figured out is, "I like to play Drop-the-Handkerchief." I'm assuming it's some kind of 40's game or reference, or else it's something convicts play in the state prison shower....
I've been told by another deputy (who was a background investigator before going back to patrol) that after 10 years on the job, almost all cops fail the same test. I guess something about this jobs tends to make us a little warped...;)
Anyway, psych tests blow. They are about as fun as jogging home after your own vasectomy.