“Firearm” under Idaho Code means a handgun and does not include any machine gun, firearm silencer, or any destructive device.  Qualified retired law enforcement officers may carry concealed firearms subject to certain conditions.

A qualified retired law enforcement officer is a person who had retired in good standing from service with a public agency as a law enforcement officer.  The retirement should have been for reasons other than mental instability.  The officer must be a person who was authorized by law to prevent any violation of law and had statutory powers of arrest.  S/he must have an aggregate service of 15 years or more.  The retired officer must have been qualified to carry a concealed firearm during the most recent twelve month period and was not prohibited by federal law from receiving a firearm. An enforcement personnel/ peace officer is permitted to carry firearms in the performance of his/her official duties. [i]

[i] Idaho Code § 18-3302H, Idaho Code § 37-2740.