"John Stalker" is a former Deputy Chief Constable of Greater Manchester Police, now residing in Lymm. He headed the Stalker Inquiry that investigated the shooting of suspected members of the Provisional Irish Republican Army in 1982. He has also had a television and literary career.

More John Stalker on Wikipedia.

Every raid has an element of risk, and the system now is generally to put in protected officers followed by forensic and detectives.

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So the officers going in later would expect the scene to be preserved and safe.

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