Investigators in the case against former Subway spokesman Jared Fogle , who pleaded guilty last Wednesday to "unlawful commercial sexual acts" with minors and possession of child pornography, had a secret weapon: a "porn-sniffing" dog.

OK, the dog doesn't literally sniff out porn; he sniffs out electronics. But there is often porn on them.

Bear, a 2-year-old black lab rescue, has been trained to track down hidden flash drives and other devices that might contain illicit material. According to NBC , only four other dogs in the U.S. have the unique ability.

"I thought I was being punked, but it does work," Steven DeBrota, the lead prosecutor on the Fogle case, told NBC in a segment on Bear featured Wednesday.

And according to the dog's handler Todd Jordan, Bear -- whose training took just four months -- is indispensable in taking a bite out of crime.

"You think about investigators going into a house and trying to find a micro SD card that is as big as a finger nail ," Jordan told CBS4, explaining how easily a human might overlook the drive. "It will take investigators hours, especially if someone is trying to hide it."