Tonight, nearly a fifth of police shot dead in America are killed by their own firearms. This report looks at a prototype gun that only fires in the hands of its rightful owner. Plus, a bra designed to detect breast cancer by measuring breast temperature. Also, a new way of tracking down smugglers threatening to wipe out the Cape abalone, a rare giant limpet from South Africa. Presented by Howard Stableford and Shahnaz Pakravan, with Vivienne Parry and Jez Nelson.

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