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

toggle caption Gloria Hillard for NPR

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

toggle caption Pat Greenhouse/Boston Globe via Getty Images

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