The individual items for such tests have already been made, without any shots having been fired. The money barrier is that a test publisher would have to conduct a validation study of a battery of such items on a norming population, and a publisher will only do that if it expects a market to develop for such tests. If people don't want to know who is more rational and who is less rational--perhaps because of what they would find out about themselves--it may be difficult initially to establish a market for rationality tests.

Interesting. And now that I've read Measurement in Psychology I understand what that means. (Thanks for the tip, btw.) My thinking though was more along the lines that such a test would prove very controversial if it effectively allowed employers to screen out, say, all religious people or something like that. (Without actually asking any questions about whether they believed in god or what religion they were.)

Incidentally, do you know if anyone has ever made a test of intellectual curiosity?