May an officer prolong a traffic stop to wait for a second officer to come to the scene? An officer may want another officer present to provide backup, or may need assistance from an officer who speaks Spanish, is proficient at administering Standardized Field Sobriety Tests, or is a certified Drug Recognition Expert. Under Rodriguez v. United States, 575 U.S. __ (2015), a traffic stop may last no longer than necessary to complete the “mission” of the stop — addressing the traffic violation that prompted the stop while attending to officer safety. When waiting for another officer is part of the mission of the stop is a question with which courts across the country are grappling.