In five internal reports made public yesterday as part of a lawsuit, New York City police commanders candidly discuss how they had successfully used "proactive arrests," covert surveillance and psychological tactics at political demonstrations in 2002, and recommend that those approaches be employed at future gatherings.I think we're all "obviously potential rioters" on this bus.Among the most effective strategies, one police captain wrote, was the seizure of demonstrators on Fifth Avenue who were described as "obviously potential rioters."