Aurora shooter, Gary Martin, has passed two firearms background checks, despite his conviction for felony

The disgruntled worker who killed five people in Aurora, Illinois, last week after being fired, had passed two firearms background checks five years ago, despite a Criminal record that should have prevented him from owning a gun, revealed Fox News.

The first check allowed Gary Martin to acquire an Illinois gun owner ID card, or FOID card, to possess a weapon. The second allowed Martin to purchase a Smith and Wesson 40-gauge handgun from a local dealer in 2014.

None of the checks disclosed Martin's conviction for a 1995 crime in Mississippi for aggravated assault.

"I do not know exactly what happened within the Illinois State Police with respect to these background checks – that it's a matter of course." A simple human error or if they just did not do all the checks – but those errors involving Martin occurred in the same way. "Because of the budget cuts, the police have had to deal with a lot of time to issue FOID cards," said John Lott, columnist for Fox News and founder of the Crime Prevention Research Center.

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"I know that the state police felt that it was almost impossible for them to cope with the growing number of requests for FOID cards and increased arms sales, even though their budget was cut in half" , did he declare. I said.

Martin's conviction was finally discovered when he was given a third background check on a concealed carry permit that he asked for five days after the Smith and Wesson purchase.

As a result, his request for a hidden carrier's permit was denied, his FOID card was revoked and a letter was sent informing him to voluntarily surrender the firearm, which he has never done. It is also unclear whether the police followed up on the letter.

Martin, 45, was killed in a shootout with officers on Friday, ending a deadly rampage with the Smith and Wesson, equipped with a laser, in Henry Pratt's warehouse. Five officers were also injured in the attack.

Among the victims of the shooting were the factory manager and a human resources intern on his first day of work.

The sentencing of Mississippi resulted in a five-year prison sentence for Martin, who served less than three years, the Washington Post reported.

Martin pleaded guilty to abusing an old girlfriend, having hit her with a baseball bat and stabbed with a knife, according to the newspaper.

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On Saturday, Aurora police chief, Kristin Ziman, said at a press conference that the conviction would not necessarily have manifested itself during a criminal record check of the FOID card . She did not elaborate.

But Lott says it's not true.

He added that the FOID check would imply that Martin's name would be registered through the FBI's national Criminal Background Check System.

"If his name was entered correctly, his criminal history would be relieved," said Lott.

Martin's background check for the concealed carry permit was based on a fingerprint, which was not used in the background checks on the FOID card and the purchase of the gun, Ziman said.

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This does not preclude, says Lott, that this does not explain why Martin's conviction was not reported in these background checks.