Detective chief inspector Mick Neville of the Metropolitan Police said that the devices helped solve less than 3% of street crimes such as robbery.
One of the biggest problems is that criminals were not afraid of cameras, as they assume they are not working, he said.
A recent Home Office report on CCTV revealed that up to 80% of footage gathered was "far from ideal" for police use.
He added that officers also needed more training in how to use footage.
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