If this research pans out then we can all look forward to having our brains scanned on a regular basis. All to prevent terrorism of course.
On the plus side of course everyone will trigger this alarm as showing pictures of a city which they have associations with or a bomb should elicit strong reactions in anyone. If they showed me a picture of Cameron, Clegg or Obama they would whisk me away pronto and I have not thought, yet, about bumping them off.
I would envisage that despite what they say they may only get anough info to put the suspects in Guantanimo Bay without trial as they would certainly not get enough evidence to charge them with anything in a court of law.
One to be put aside for specific use I think. And not one in any way associated with real Justice. Maybe UK/US justice though.

The question is if you wish to have your brain scanned or not. Do you think this is related to pre-crime?
Won’t have a choice though will you? It’ll be forced upon you at the States whim.
It is related to pre crime but with a difference. This means you are thinking about something related to the subject.