The data in Law Enforcement Officers Killed and Assaulted (LEOKA) pertain to felonious deaths, accidental deaths, and assaults of duly sworn city, university and college, county, state, tribal, and federal law enforcement officers who at the time of the incident met the following criteria:
In addition, their deaths must have been directly related to injuries received during the incidents.
Trend data from the past 10 years do not include the officers who died as a result of the events of September 11, 2001. Combining these data with the statistics traditionally included in the annual LEOKA reports would have had an outlier effect, skewing measurements and analyses of LEOKA data. However, a special report concerning the law enforcement officers who died as a result of the terrorist attacks is included in the 2001 edition of Law Enforcement Officers Killed and Assaulted.