II 115th CONGRESS 1st Session S. 708 IN THE SENATE OF THE UNITED STATES March 23, 2017 Mr. Markey (for himself, Mr. Rubio , Mr. Brown , and Mrs. Capito ) introduced the following bill; which was read twice and referred to the Committee on Homeland Security and Governmental Affairs A BILL To improve the ability of U.S. Customs and Border Protection to interdict fentanyl, other synthetic opioids, and other narcotics and psychoactive substances that are illegally imported into the United States, and for other purposes.