We recommend that CBP’s Office of Field Operations assign responsibility for ensuring STOP Act implementation, including: a. monitoring and resolving advance electronic data quality and quantity issues; b. documenting justifications for advance electronic data waivers; c. providing lists of advance electronic data waivers to International Mail Facilities and implementing routine, alternate screening for mail from countries with advance electronic data waivers; and d. enforcing penalties when the U.S. Postal Service accepts mail without advance electronic data.