I believe in the same session that the Supreme Court found DUI checkpoints to be Constitutional they found that flag burning was a Constitutionally protected form of free speech.
So next time you get stopped at one of these checkpoints, step out of the vehicle and set fire to Old Glory. You’ll tie our entire Federal Court system in knots for the next 13 years as they figure out what to do with you.
No. They'll get you for arson, interfering with police, and disturbing the peace, at least.