Therefore , the officer 's authority to continue the stop ended once he completed his investigation of that infraction .
Justice Ginsburg wrote that the purpose of the initial stop in this case was to investigate why Rodriguez swerved out of his lane of traffic .
The officer 's authority to continue the stop ended once Rodriguez completed Rodriguez 's investigation of that infraction .
Justice Ginsburg wrote that the purpose of the initial stop in this case was to investigate why Rodriguez swerved out of his lane of traffic .