Yes! Finally some sense in the world:

Mark Duggan death: Armed police to wear video cameras

Police really should be recording video at all times while on duty. There are so many advantages:
  • People tend to provoke officers less.
  • People tend to file fewer false complaints - there's no way to get away with lying.
  • Encourages officers to act professionally and avoid abuses of authority.
  • When an encounter resulted in harm, there is compelling evidence on whether the officers' behavior was justified.
There really isn't a down side, except for the technical cost of recording, which is minimal.