For more information on policing in Massachusetts, see entry on Boston Police.
- Partnership/Ownership/Membership – Immigration and Customs Enforcement (ICE)
US Immigration and Customs Enforcement (ICE) currently holds a 287(g) agreement with the Barnstable County Sheriff's Department. As reported by GBH: "287g agreements allow officers to interview already-detained people in county jails about their immigration status, check the Department of Homeland Security’s databases for information on those individuals, issue detainers to hold individuals set to be released so that ICE can then detain them, and share any information with ICE. They can also recommend and begin the process of deporting individuals."