In some cases it may be that the victim's act was reasonably foreseeable, e.g. where the defendant causes a brilliant pianist to loose her fingers, or a keen sportsman to be paralysed. It could then be argued that, applying the rule in R v Roberts and R v Williams and Davies, the chain of causation is not broken by the victim’s suicide. However, the House of Lords in R v Kennedy must throw doubt on this argument. In this case, the House of Lords decided that a person who supplies a drug to another has not caused that drug to be administered when the other injects himself with it. In such circumstances the chain of causation is broken by the voluntary and informed decision to act. The court refused to apply a test of reasonable foreseeability.