Some police forces are using automated facial recognition technology to pick suspects out of a crowd. But is face mapping a valuable tool in the fight against serious crime or a new threat to our civil liberties? And does it work? Joshua Rozenberg investigates.Also in this week's programme...Do body-worn video cameras help police to deal more effectively with domestic violence incidents - or do they make matters worse?And the mysterious case of the "pernicious weed"...who should pay when the wrong kind of vegetation - such as Japanese knotweed - is found on railway lines?Producer: Neil Koenig
Researcher: Diane Richardson.

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