All public schools in Prince George’s County are scheduled to participate in a system-wide lockdown drill on Tuesday.

The drill, which will begin at 10 a.m. and last for about 20 minutes, will test the school system’s procedures for protecting students and staff in the event of an emergency, school officials said.

Visitors will not be allowed to enter the schools during the drill.

The drill is one of the several short-term recommendations to enhance security following last year’s shooting rampage at a Connecticut elementary school that left 20 children and six adults dead.

School officials have also implemented a plan for “100 percent identification, 100 percent of the time” for every person entering schools, and police patrols of elementary schools.

Some of its long-term recommendations include forming a school police force, and installing cameras and buzzers at some of the schools.