'About 2 1/2 hours before the attack, authorities said Wednesday, an Arizona state wildlife officer stopped Loughner for running a red light but had no reason to search the vehicle and allowed the young man to leave with a warning.'
'In the hours before Jared Lee Loughner allegedly tried to assassinate Rep. Gabrielle Giffords (D-AZ) and killed six others, his father chased him into the desert as he carried a mysterious black bag in his hand, the Associated Press reported.'
It's too bad his father did not call the police, saying he did not know what his son had or planned.
Then the red light pull-over may have had probable cause.
Even so it was a legally possesed gun and he hadn't committed a crime yet.