Story highlights TSA received more than 30,000 claims of missing valuables between 2010-2014

Most of the missing valuables were packed in checked luggage

Miami-Dade police set up hidden cameras as part of sting

Miami (CNN) Inside a plane at Miami International Airport, baggage handlers are going on a shopping spree with passengers' bags.

What they don't know is that they are being recorded on a hidden camera. The Miami-Dade Police Department set up the camera as part of an ongoing police investigation into luggage thefts by the very airport workers who are supposed to get bags safely onto planes.

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"It's a problem we all face," said police Lt. Pete Estis. "We will continue to be proactive until we can see that the claims of pilfering through luggage will actually decrease."

Miami Aviation Director Emilio T. González said the insider theft cases "are indeed the exception among the thousands of decent, hardworking employees at MIA, and they have been prosecuted to the fullest extent of the law for their crimes."

And these insider thefts just don't happen in Miami. A CNN analysis of passenger property loss claims filed with the TSA from 2010 to 2014 shows 30,621 claims of missing valuables, mostly packed in checked luggage. The rest occurred at security checkpoints. Total property loss claimed: $2.5 million.