Federal customs officers are making more drug seizures in Chicago than any other part of the country due to a growing drug-mailing trend that is inundating O’Hare International Airport, according to homeland security officials.

The Chicago field office of U.S. Customs and Border Protection finished the 2018 fiscal year last September with more drug seizures than any of the agency’s 20 regional offices nationwide, according to data obtained by the Washington Examiner.