DO NOT ADVISE THIS INDIVIDUAL THAT THEY MAY BE ON A TERRORIST WATCHLIST.

    CONTACT THE TERRORIST SCREENING CENTER AT [REDACTED] DURING THIS ENCOUNTER. 
    IF THIS WOULD EXTEND THE SCOPE OR DURATION  OF THE ENCOUNTER, CONTACT THE TSC 
    IMMEDIATELY THEREAFTER. IF YOU ARE A BORDER PATROL OFFICER, IMMEDIATELY 
    CALL THE NTC.

    ATTEMPT TO OBTAIN SUFFICIENT IDENTIFYING INFORMATION DURING THE ENCOUNTER, 
    WITHOUT OTHERWISE EXTENDING THE SCOPE OR DURATION OF THE ENCOUNTER, TO ASSIST THE 
    TSC IN DETERMINING WHETHER OR NOT THE NAME OR IDENTIFIER(S) YOU QUERIED BELONGS 
    TO AN INDIVIDUAL IDENTIFIED AS HAVING POSSIBLE TIES WITH TERRORISM.

    DO NOT DETAIN OR ARREST THIS INDIVIDUAL UNLESS THERE IS EVIDENCE OF A VIOLATION OF 
    FEDERAL, STATE, OR LOCAL STATUTE(S).

First, this looks like boilerplate text. If so, "DO NOT ADVISE..." means, in general, "do not advise anyone on a terrorist watchlist that they are on the watchlist". That text would make sense if, for instance, this is what an LEO sees on their MDT screen when they look up someone's identity. Counterterrorist workers want to collect information from LEOs, so they need to flag people to get reports --- but they don't want that to come at the expense of tipping off terrorism subjects that they're under investigation. That's a warning that might make a lot of public policy sense when the FBI is tracking Abdul Kadir and his plot to blow up JFK, but not as much sense for Jeremy Hammond.

The all-caps text and awkward structure of the prose sort of suggests that's what this is: the stuff that shows up on the cop's MDT screen when they run someone's identity and they've been flagged.

Second, each of the three paragraphs in this notice to LEOs directs the officer not to detain the subject based on the notice. Presumably that's because doing so can generate evidence that will then be excluded at trial, because merely being on a watchlist does not provide the police with probable cause to search or arrest.

Finally, people should remember that while our immediate association to the word "terrorism" is 9/11 and Islamist militants, the FBI tracks a pretty broad range of domestic terrorist groups --- including parts of the militia movement, radical animal rights groups, white supremacist groups, and "anarchist extremists", a category they surely didn't make up for Hammond, but which Hammond could easily have fallen into.

(In case it needs saying, while it may once have been the case in the '60s and '70s that there were radical anarchist groups that merited special tracking at a national level, I do not think the "anarchist extremists" of 2015 --- even the ones who try to scare the horses the mounted police are riding at the NATO protests --- qualify as "terrorists". The separatist militia movement, though? I'm glad we're calling them what they are.)