School safety; employment of school security officers; criteria. Modifies the criteria that an individual employed as a school security officer, as defined by applicable law, must satisfy in order to carry a firearm in the performance of his duties by eliminating the requirement that within 10 years immediately prior to being hired, he was either an active law-enforcement officer, as defined by applicable law, in the Commonwealth or was employed by a law-enforcement agency of the United States or any state or political subdivision thereof. The bill instead requires any such individual to be age 75 or younger at the time he is hired to be a school security officer, in addition to the other requirements set forth in applicable law, in order to carry a firearm in the performance of his duties.