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If it could, and if it needed typed answers (i.e. not just selecting one answer from a selection, as some people would just keep trying and trying until they got the right ones by chance), that would possibly prevent some of the real idiots from actually joining.
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You
can actually add extra fields to the registration process, so that it emails quiz answers (or perhaps just a few answers to questions designed to catch out potential idiots) to the admin when it informs him that a new member has registered.