"There are no tests to identify the mental psychopathy which would cause the
behavior. Furthermore, young people are very good at hiding facts about themselves.
For example, look at how many parents are surprised when their sons or daughters
'come out of the closet'." (Or words to that effect.)

That would take the wind out of the sails (boating related) of those wanting 'mental
tests' for a gun permit.
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Ban idiots, not guns!