1. Train your greeters.
Greeters must be trained to profile people coming into the church. If a man shows up with a long coat in heat of summer, that could be because he is hiding a rifle. Greeters need to know what to do in a wide variety of scenarios.
Greeters should be some of the very first people you train. The first deterrent to preventing an active shooter is to train your greeters to be on the lookout for anyone that might seem suspicious.
That doesn’t mean they’re trained to fight somebody they think is suspicious. But they do need a system.
It’s important to have active shooter and intruder workshops though out the year.