David Frum has this to say:
A convicted felon clutching a syringe and ranting about his dishonorable discharge can enter a gun dealer's premises and — so long as his name does not appear in a database — the seller remains legally immune no matter how much objective warning he had that his customer was a prohibited possessor. Under the 2005 federal Protection of Lawful Commerce in Arms Act and similar state laws, vendors can generally be held liable for a sale only if they can be shown to have had affirmative knowledge that the gun buyer intended to use the weapon to commit a crime.
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