The District has entered into agreements with the various counties that BART runs through to use their specialized units on BART property, when necessary. The Alameda County Sheriff's Office, San Francisco Sheriff's Office, and San Mateo County Sheriff's Office provide specialized units to address critical incidents on BART facilities that are in their counties. Several BART officers are assigned to the Central Contra Costa County SWAT team, which will provide the same services in Contra Costa County. The Central County SWAT team is made up of officers from BART PD, Martinez PD, Pleasant Hill PD, San Ramon PD, and Walnut Creek PD.