This vehicle is fast and has been used by FBI in Gta Vice City Stories and Its in Gta Vice City aswell but FBI uses FBI Rancher instead.In Gta San Andreas This vehicle is not that fast and doesnt have great handling,so Its not being prefered much from cops in the servers.You can find more information here https://gta.fandom.com/wiki/FBI_Washington
https://gta.fandom.com/wiki/FBI_Washington