snipers, tear gas, militarized police in portland oregon nov. 13 2011...eviction of peaceful political protest

"Not only have cops been known to go undercover to infiltrate rallies, but they can also lie and commit some crimes as part of their missions.

 Sometimes, they may even pretend to be your friend, encouraging you to commit a crime.

 Entrapment, Kreuscher says, is a difficult and very specific legal principle to prove—so don't expect to rely on it if you suddenly find out your "friend" is actually the fuzz."