FRESNO, Calif. - A federal judge has rejected a request by the California attorney general to further delay his order overturning the 10-day waiting period for gun owners who want to buy more firearms.

U.S. District Judge Anthony Ishii of Fresno ruled last week that he already gave six months from his August decision before the state must implement his order. The judge found no evidence that the cooling-off period to buy more firearms prevents violence by people who already own guns.

Attorney General Kamala Harris had asked for a delay until the 9th U.S. Circuit Court of Appeals can issue its decision.

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Harris had argued it will expensive to hire and train workers or change the state's computer system to accommodate the ruling. She said that the appellate court could overturn Ishii, wasting the state's money and time.

Two gun owners and two gun-owner rights groups, The Calguns Foundation and Second Amendment Foundation, sued over the state waiting period in 2011. Californian's buying their first firearm will still have to undergo background checks and the 10-day waiting period under Ishii's order.

The ruling has drawn criticism from groups, such as the Legal Action Projection of the Brady Center to Prevent Gun Violence, which say the judge's decision is narrowly focused, but goes too far.

David Beltran, a spokesman for the attorney general's office, said the judge's ruling was being reviewed.