Sobriety checkpoints do infringe upon our Constitutional rights and protections.  An experienced DUI Defense Lawyer will evaluate how the DUI checkpoint was planned and how it was conducted to develop the best arguments against the checkpoint.  Furthermore, even if conducted properly, the police may not detain for further screening without a reasonable suspicion based on articulable facts that the driver is impaired and it may not arrest without probable cause to believe the driver is impaired.