When we want to fight plans to build a waste dump in our back yard, we take to the streets in protest. But what if that results in the police filming and searching us, noting down our car registrations and keeping our details on file for up to seven years?
Panorama asks if police tactics aimed at preventing troublemakers taking over demonstrations are eroding the freedom to protest for all but the most hardened activists.
Undercurrents footage was used in the making of this programme
Broadcast on: BBC One, 8:30pm Monday 6th July 2009
Duration: 30 minutes
Watch it here