There was a 4th sniper team that was said to be LEO's but they never name what organization they were with, ATF, FBI, PSP, dudes with cracker jack badges? the simple fact that the acoustics recorded have three distinct gunshots, is very telling. The fact that the USSS director was told how many casing were recovered but refused to share that with the public makes the crime even worse than we think, and if its some three letter agency that went rouge. The political and PR fallout from something like that would bury that agency forever.