The day after the shooting in Connecticut a lot of people in Colorado tried to buy a gun.
The Colorado Bureau of Investigation says it received 4,154 requests for background checks from potential buyers on Saturday.
That was so many the CBI couldn't process them all and the backlog grew to nearly 18 hours. The Unit could only process 3,001 checks on Saturday.
Extra staff was brought in over the weekend and workers are still trying to clear the backlog.