WaPo: Mexican national arrested in Florida on accusation of spying for Russia by Brittany Shammas. The story describes a border exit search:
Two days later, the couple was intercepted after arriving at Miami International Airport for a flight to Mexico City, federal prosecutors said. Customs and Border Protection inspected the wife’s phone and discovered “a close-up image of the license plate” in a folder of recently deleted photographs. Fuentes admitted telling her to take the picture. A search of his phone found that she had sent the photo to him using WhatsApp and that he had been communicating with the Russian official.