The NYPD is able to conduct operations that would be illegal under civil liberties restrictions for the Federal Government to conduct, in particular targeting various ethnic communities.
The CIA, under US law is forbidden from spying on Americans.
"Your stupidity, Allen, is simply not up to par." -- Dave Mack (mack@inco.UUCP) "Yours is." -- Allen Gwinn (firstname.lastname@example.org), in alt.flame