Have a cell phone? Belong to social media? All checkpoints are texted, Tweeted, and Facebooked. In other words, even though this is still a clear violation of the 4th, those actually driving under the influence are avoiding the checkpoints anyway. Waste of time, waste of money, waste of parchment and ink on the part of the Framers.
Heck, the police text and tweet their own locations! I receive road and traffic info from the local police dept and they make sure all sobriety check points are sent out days ahead of time. In fact I have changed my route on several occasions in order to avoid the traffic backup I know will occur.