Nitro would like a word.

The three-year-old chocolate Lab working with Customs and Border Protection at Philadelphia International Airport recently sniffed out $44,690 in undeclared cash from a passenger headed to Cancun, and federal officials are using the moment to remind summer travelers that bulk cash and airports are a combination that tends to end badly.

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The traveler, a 54-year-old naturalized U.S. citizen from Peru, had cash stashed in his pockets, in separate envelopes, and inside his carry-on, according to a CBP press release . When officers asked what he was carrying, he said $10,000. That’s the magic number, the federal threshold above which international travelers are legally required to file a declaration. He had considerably more than that.

A thorough inspection found considerably more than $10,000.…