From the Summary: "Firearms are one of the leading causes of deaths for law enforcement officers feloniously killed in the line of duty. Since FY1999, Congress has provided funding to state and local law enforcement agencies to help them purchase armor vests for their officers. The Matching Grant Program for Law Enforcement Armor Vests (hereinafter, 'BPV program') provides grants to state, local, and tribal governments to purchase armor vests for use by law enforcement officers and court officers. The BPV program was first authorized by the Bulletproof Vest Partnership Grant Act of 1998 (P.L. 105-181). It has been subsequently reauthorized four times. The most recent reauthorization expired in FY2012. Between FY1999 and FY2012, annual appropriations for the program generally ranged been between $25 million and $30 million. However, over the past four fiscal years, annual appropriations for the program were less than $23 million."
CRS Report for Congress, R43533
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html