This isn't the end of Posse Comitatus, but they're starting to chip away at it. They are also developing big brother type systems instead of finding pragmatic solutions to security.
the FBI "Carnivore" system was just scrapped.
When every government agency, tax collectors, wildlife, enviornmental, etc. can dress in military garb, use military weapons including tanks and conduct a military operation Possee Comitatus is, for all practical purposes, dead. Apparently the only organizations not allowed to conduct military operations on US soil are the US armed forces.
Such as?
Remember, the National Guard isn't subject to Posse Comitatus laws when activated by a state governor. So, would you rather have national guardsmen doing this sort of work or SF types?