Guidance from the Attorney General: Department Activities to Protect Certain Facilities or Assets from Unmanned Aircraft and Unmanned Aircraft Systems [open pdf - 1MB]
From the Document: "Law enforcement and security agencies play a crucial role in ensuring the safe and secure integration of drone technology into the airspace. As recognized in the Department's 2019 'Policy on the Use of Unmanned Aircraft Systems', drone technology has transformative potential as a valuable law-enforcement and public-safety tool, including for use in crime scene investigations, search and rescue operations, and security assistance. As drones become more powerful and capable, however, they also become a more attractive tool for criminals, terrorists, and other bad actors to cause disruption and destruction. Unfortunately, the threat is not theoretical."
U.S. Department of Justice: https://www.justice.gov/