The most common classification of firearms is done by types, and the most commonly used tool for firearms identification is the Firearms Reference Table (FRT). The FRT is a computerized database available online and offline. It was proposed and developed by Canadian Royal Mounted Police and it was further adopted by INTERPOL as a reference classification tool. Use by individuals who have been authorized by the RCMP. Authorized users include members of the police community, specific Public Agents and approved firearm verifiers.