A sniffer dog works on the side of the pitch following the evacuation of Old Trafford stadium in Manchester, U.K., on Sunday. The match between Manchester United and Bournemouth was postponed after a suspicious package was discovered at the stadium. Oli Scarff/AFP/Getty Images hide caption

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Oli Scarff/AFP/Getty Images

Indiana "Indy" Bones reports for duty on a field investigation, in which the dog sniffs to detect human remains for a reopened cold case. Gloria Hillard for NPR hide caption

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Gloria Hillard for NPR

Police Dog On Payroll: 'Indiana Bones' Is Woman's Best Friend

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Tom Robichaud launched his business, Discreet Intervention, six months ago. Here, he works his dog in a vacant office building, hitting on a cylinder containing cocainelike drugs. Pat Greenhouse/Boston Globe via Getty Images hide caption

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Pat Greenhouse/Boston Globe via Getty Images

Drug-Sniffing Dogs Ease Parents' Minds — Or Confirm Their Fears

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