We all saw this one coming.

Former cop suing gun shop after he accidentally shoots himself

That a gun store owner had a loaded pistol on display was utterly irresponsible as was the clerk handing a weapon to a customer without checking to make sure said weapon was safe, BUT the customer was a police officer and supposedly trained in the use of firearms. He should have checked the weapon to make sure it was safe when it was handed to him. Lots of fault to go around here.