The footage shows officers using several restraint techniques that were critised in a report written by a police trainer for the IPCC.

录像片段显示出了警察使用过的擒拿手段，而在一位警察教官写给IPCC的报告中，对这些手段提出了批评。

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Trainer 3– Head of Forensic Science Faculty of a leading university, and former superintendent of one of the largest UK Police forces.

导师3–现任某重点大学法医学院主管，曾担任英国某大警察部的警务长。

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Ellen Kirschman, a psychologist, police trainer, and author of "I Love a Cop, " writes about the paradox between an officer's work life and personal life, and how police work changes people.

CNN: Cops, suicide and a father's cause

Homeowners are being asked to check gardens and out-buildings as police search for a racehorse trainer who has been missing since Monday.

BBC: Owen Brennan: Police continue search for missing trainer

The police ushered the group into the farmhouse, owned by a breeder and trainer of racehorses, Jeremy Maxwell.

BBC: Shergar: The day the wonder horse was stolen