From the Document: "DHS employs approximately 80,000 Federal law enforcement officers whose positions allow for the use of force as they perform their duties. Every day law enforcement officers face danger when performing their duties. These officers have very little time to assess the situation and determine the proper response when dealing with a dangerous or unpredictable situation. The officers must react to the threat or potential threat and respond with the appropriate tactics -- possibly including some level of force. DHS has not done enough to minimize the risk of improper use of force by law enforcement officers."
Department of Homeland Security, Office of the Inspector General, Report No. OIG-17-22
Department of Homeland Security Office of Inspector General: https://www.oig.dhs.gov/