The Crown Prosecution Service is to issue new guidelines in England and Wales on "joint enterprise" cases that allows every member of a gang to be charged with murder even if only one of them carried out the killing.

Lorraine Fraser, whose son Tyrone Clarke was stabbed to death in 2004, describes how current "joint enterprise" law was used in her son's case and Lord Ken Macdonald, former director of Public Prosecutions for England and Wales, outlines the complexities of the law.

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