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In page Non-lethal weapon:

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Several groups maintain there is great room for improvement in non-lethal weapons and procedures for their use. Claims for the relative safety of such weapons are usually contingent on their being used "properly". For example, the rubber bullets developed during the 1960s were supposed to be fired at the ground and hit the target only after ricochet,[1] and other non-lethal bullets are designed to be fired at the lower body; they can be lethal if fired directly at the head.[citation needed]