CCTV malfunctions continue?

After the last example of state violence which strangely failed to show up on CCTV, the news is full of another vid of someone getting whacked by the authorities:

A police sergeant seen in video footage apparently hitting a woman during the G20 protest in London has been suspended, Scotland Yard has said.

The officer appears to hit the woman in the face with his hand and then the leg with his baton after she swears at him.

The Independent Police Complaints Commission - already investigating the death of Ian Tomlinson during the 1 April protests - is examining the case.

Let's hope that relevant CCTV footage will be found - it would reassure me that the things are actually working as you'd expect them to (rather than working like this). According to the posters the Met have been putting up, anyone seen examining a CCTV camera ought to be shopped as a terrorist suspect - surely they now have the cast-iron defence that 'I was just wondering whether any of these things actually work, officer.'