Suspect Jared Loughner pleaded not guilty last week to 49 additional federal charges stemming from the shooting. He had previously pleaded not guilty to charges of trying to assassinate Giffords and attempting to murder two of her aides.
The Army rejected Loughner for failing a drug test, and Pima Community College banned him from campus after he exhibited unstable behavior, but he was able to legally purchase a semi-automatic pistol that authorities say he used in the attack.
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