Greyhound to Stop Allowing Immigration Checks Without a Warrant Greyhound, the nations largest bus company will stop allowing Border Patrol agents without a warrant to board its uses to conduct routine immigration checks. This comes one week after a report leaked confirming agents can’t board private buses without the consent of the bus company. Greyhound said it would notify the Department of Homeland Security that it does not consent to unwarranted searches on its buses or terminals not open to the general public. How do you feel about Greyhound not allowing immigration checks without a warrant?