It is worth pointing out that post 9/11 these distinctions are less clear though. For example, I believe the NYPD is trained in counter terrorism and intelligence now as well. The general distinctions still stand but the lines are getting muddier. I still perceive the intelligence agencies as having a big fat line between them and the police agencies though (meaning I do not see intelligence agencies acting as police agencies), even if the police agencies are starting to act more like intelligence agencies.