If you have an Active Shooter response program in place, that is great. If you have robust controls in place I applaud you for considering your employees!
Your employees must know best practices when confronted with an active shooter scenario. Provide them with that guidance.
Professional in-person training seminars and classes can be potentially life-saving. One of the active shooter response classes I took was at my local library given by a top professional. It was well worth the time!!!
A valuable booklet is the Homeland Security Active Shooter – How to Respond booklet. https://www.dhs.gov/xlibrary/assets/active_shooter_booklet.pdf
Your employees will appreciate your concern for their safety and security!