In a modern police department, an armorer inspects, maintains and repairs firearms to the standards required by the manufacturer's warranty. An armorer cleans and adjusts all the handguns used by police officers. He or she also maintains the shotguns, semi-automatic and automatic weapons the officers must depend on in a crisis. Other equipment maintained by armorers includes gas masks, gas-grenades, smoke grenades and similar devices. An armorer is often involved in training other members of a department in chemical warfare equipment and practices. 