where the defendant has a high degree of control over the claimant, the law may impose a positive duty on the defendant to act; even to the point of preventing the defendant from physically harming himself or herself. This can be clearly seen in Reeves v Commissioner of Police for the Metropolis [1999] 3 All ER 897, a case we have already considered under Special Duties - The Police . Here, the Court of Appeal held that a duty did exist on the police to protect a prisoner’s health including the possibility that they may attempt suicide.