Boulder County prosecutors said Thursday morning they will not charge Colorado Rep. Lori Saine in connection with her arrest last week at Denver International Airport on suspicion of bringing a loaded handgun through security.

“The evidence in this case indicates that Lori Saine forgot the firearm was in her purse,” the Boulder County District Attorney’s Office said in a written statement. “Based on the evidence presented, it is the District Attorney’s position that no criminal case against Ms. Saine can be proven beyond a reasonable doubt, and thus pursuant to the ethical standards guiding prosecutors in Colorado, no charges will be filed in this case.”

Saine, R-Firestone, was accused of bringing a loaded 9mm, semi-automatic handgun into a DIA security checkpoint on Dec. 5. Court documents say she had the loaded, 9mm semi-automatic handgun in her bag.

Denver police arrested her and she spent a night in jail before being released on bond Dec. 6.

“When Denver PD officers, who were not aware that Ms. Saine was a public official, contacted Ms. Saine, she indicated that she ‘totally forgot’ about the gun,” the statement went on to say. “After being mirandized, Denver police attempted to further interview Ms. Saine, who refused and instead requested an attorney, as is her right.”

The statement continued: “At that point Ms. Saine was taken into custody for violation of C.R.S. 18-9-118, possession of a loaded firearm in a facility of public transportation. After obtaining an attorney, Ms. Saine submitted to an interview. During the interview she described the circumstances surrounding the incident.”

Boulder County prosecutors say they determined “that charges are not appropriate.”

The Boulder County District Attorney’s Office was named a special prosecutor in the case since Denver District Attorney Beth McCann worked with Saine at the state capitol before being elected to the post last year.

In the past 12 months, the Denver Police Department has responded to just over 100 reports of a firearm within a security checkpoint at DIA, police records administrator Mary Dulacki said. Just one person other than Saine has been arrested and jailed for possession of a weapon within a security checkpoint over that span.

Guns can be brought on planes, but only in checked baggage.

Saine has been a defender of gun rights at the Colorado Capitol, battling a bill banning high-capacity ammunition magazines in 2013.