I don't know if I'm even aware of a major (publicized) terrorist attack attempt post 9-11 that COULD have been successful. We had a guy with a binary explosive in his shoes, the Christmas fellow, that group of fellows on the east coast (I want to say) a few years back that the media tried to play up as a threat, and then the Times Square fellow who didn't know what he was doing at all despite being trained.
Wait. A BARCODE scanner?
From my experience, the last thing that gets cut is rescue services, right after schools. The first thing that gets cut is the local library, citizen's programs, parks & recreation, etc. Perhaps this is different elsewhere.