You raise a good point (except for that Detroit nonsense). I think it would be helpful to penalize illegal gun sales with a life sentence. That might help to discourage it. Also, using underage kids as go-betweens should be similarly treated.<quoted text>
How do you give criminal background checks for those seeking to own firearms by stealing them from someone else or through the black market? I haven't the statistics but I bet over 90% of firearms owned by citizens of the fair city of Detroit are stolen,
As for your black market comment, my above suggestion would apply, as well as to sales at gun shows to just about anyone, sales via the internet, etc.
I recognize that there is no panacea, but anything to keep guns out of the hands of the mentally disturbed should be considered.