Page last updated at 13:52 GMT, Friday, 14 January 2011

Second police spy in climate protest group revealed

The trial of six green campaigners collapsed earlier this week after an undercover policeman who had infiltrated their group offered to give evidence on their behalf.

As a second police spy in an environmental group is revealed, Richard Watson reports on the deepening controversy over the use of police agents.

Broadcast on Thursday 13 January 2011.

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