The Supreme Court confirmed the constitutionality of DUI checkpoints in Michigan Dept. of State v. Sitz [0][1].
[0] https://en.wikipedia.org/wiki/Michigan_Department_of_State_P...
[0] https://en.wikipedia.org/wiki/Michigan_Department_of_State_P...
Whether the companies capitulate on their own accord or due to some behind the scenes strong arming is another matter.