See article: Law enforcement in Westchester County
The Westchester County Department of Public Safety was created in 1979 by merging the Westchester County Sheriff's Office with the Westchester County Parkway Police.
The current Commissioner/Sheriff is George Longworth.
The department provides primary police coverage for county parks, parkways and facilities as well as for the Town/Village of Mount Kisco. It also provide patrols within Town of Cortlandt. The department is the fourth largest law enforcement agency in Westchester County after the New York State Police, the Department of Corrections and the City of Yonkers Police.
Westchester County Department of Public Safety handles all the patrols as well as emergencies for Westchester County.
Officers are armed with the Smith & Wesson M&P 9mm which replaced the aging Smith & Wesson 5906 (Model 5946). Officers are also issued a Colt AR-15 patrol rifle which is mainly utilized during intense and life threatening situations.
The Patrol services Division's uniformed officers patrol the county’s parkways, parks and public buildings. Patrol officers also assist Westchester county’s municipal police agencies in a variety of ways, including during motor vehicle stops and searches for fleeing suspects, emergency crowd control and at DWI checkpoints and other targeted enforcement. The PSD includes Breath Test Operators and Drug Recognition Experts (used to process arrests for driving under the influence of alcohol or drugs), and Accident Investigators and Accident Reconstructionists. The PSD provides police and security services for the 512-acre (2.07 km2) Westchester County campus (Grasslands Reservation) in Valhalla is home to the:Westchester Medical Center, County Jail, New York Medical College, Woodfield Cottage Juvenile Detention Center, Westchester County Police Academy, County Fire Training Center, and others. The PSD also patrols the main campus of Westchester Community College (WCC) in Greenburgh while working with campus security. The PSD patrols the 18,000 acres (73 km2) Westchester County Parks system which consists of more than 50 parks, nature centers, hiking and biking trails, six commercial pools, three beaches and Rye Playland, the only government-owned-and-operated amusement park in the country.