About six weeks later, Loughner bought the Glock semi-automatic handgun used in the shooting.
His one-time friend Zachary Osler told investigators of Loughner's increasing isolation and delusional behaviour.
Mr. Loughner's parents sat silently in the courtroom, as they have at other hearings.
On Wednesday, U.S. District Judge Larry Burns ruled Jared Loughner incompetent to stand trial.
FORBES: The Insane Tragedy of Being Incompetent to Stand Trial AND Allowed to Buy a Glock 19
We still know very little about Jared Lee Loughner, the man accused of committing this atrocity.
Loughner asked if he could use the restroom, then at one point complained he felt sore.
He helped people sign in and recalled handing the sheet on a clipboard to Loughner.
Audetat also found a foldable knife with a 4-inch blade in Loughner's front pocket.
Loughner said he was feeling hot, so the deputy removed Loughner's beanie and hooded sweatshirt.
Loughner said he was heading home and understood why he was being pulled over.
The witness later described recognizing Loughner as the same person from photos on the news.
The conversation as Loughner sat in restraints in an interview room was mainly small talk.
The agent asked Loughner again if he was OK, and Loughner said he was going home.
Loughner was pulled over earlier in the day for a traffic violation by a wildlife agent.
Randy Loughner said that his son had never been diagnosed with a mental illness.
Despite their son's increasingly bizarre behavior, Loughner's parents never sent him to get help.
Pima County Sheriff Clarence Dupnik said Saturday that Mr. Loughner appeared to have psychiatric issues.
WSJ: Loughner's Prior Behavior Pointed to Signs of Imbalance
But school spokesman Paul Schwalbach said a campus officer was never assigned to Mr. Loughner.
WSJ: Loughner's Prior Behavior Pointed to Signs of Imbalance
Mr. Osler said he had heard Mr. Loughner had cut his ties with others as well.
WSJ: Loughner's Prior Behavior Pointed to Signs of Imbalance
Mr. Osler, 22 years old, also said Mr. Loughner told him he was unhappy at home.
That interest might have triggered Mr. Loughner's first meeting with Ms. Giffords in 2007.
Loughner said he wished he would have taken medication and that things might have been different.
Prosecutors have said that Loughner, who spent time on suicide watch, suffers from schizophrenia.
CNN: Attorneys for Loughner expected to enter new plea Tuesday
In February, a federal judge ruled Loughner could receive medical treatment for another four months.
CNN: Attorneys for Loughner expected to enter new plea Tuesday
Loughner earlier had pleaded not guilty to the charges against him, including murder and attempted murder.
Loughner's mental condition has been central to much of the related court proceedings since the shooting.
His attorneys consistently fought court rulings that Loughner continue his treatment at the hospital.
In discussion with prison officials, Loughner has said, "I'll never get out, " Pietz testified.
But she continued, adding that Loughner has shown improvement and he's no longer in restraints.
Police said they believe suspect Jared Lee Loughner, 22, targeted Giffords in the attack.
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