Physical restraint can be humiliating, dangerous and even life-threatening and the huge variation in its use indicates that some trusts are using it too quickly.
Face-down restraint, when a person is pinned face-down on the floor, is particularly dangerous, as well as extremely frightening to the person being restrained. It has no place in modern healthcare and its use must be ended.
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The band announced at a free concert on Friday that they would take over the event's Pyramid stage on Saturday June 25.
The victims were collecting permits and escorts a day after their home town was liberated from the extremists.
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.