One if their main duties is to go after counterfeiting of the currency. In fact it's what they were founded to do https://www.secretservice.gov/about/history h

One if their main duties is to go after counterfeiting of the currency. In fact it's what they were founded to do https://www.secretservice.gov/about/history https://www.secretservice.gov/about/history We are one of America’s oldest federal law enforcement agencies, originally created in 1865 to stamp out rampant counterfeiting in order to stabilize America's young financial system. By the end of the Civil War, nearly one-third of all currency in circulation was counterfeit. As a result, the country’s financial stability was in jeopardy. To address this concern, the Secret Service was established in 1865 as a bureau in the Treasury Department to suppress widespread counterfeiting.