Print National Desk The FBI has agreed to consider modifying its criminal background check system after the Justice Department's inspector general found the system did not cross-check the buyer's age with legal requirements of their home state, according to a report released on Thursday. Under federal law, customers are not allowed to buy firearms, specifically a rifle or a shotgun, in a jurisdiction that is different from the address listed on their identification unless the customer's age is legal in both the state of sale and where the person lives, according to the report. The findings stem from an Office of Inspector General's audit that was launched, in part, after Colorado lawmakers asked the agency to probe the National Instant Criminal Background Check System (NICS), which is used by licensed federal firearms sellers and other retailers, after an 18-year-old purchased a shotgun in Colorado even though she was a resident in Florida, which prohibits the sale of firearms to anyone under 21.