From a post by CHILNVLN (7/21/2011):
"DUI checkpoints have been determined to be part of a regulatory scheme in furtherance of an administrative purpose, and not traditional criminal investigative stops. The primary purpose of a sobriety roadblock is to promote public safety by keeping intoxicated drivers off of public streets and highways. Therefore, if the appropriate guidelines have been followed, DUI checkpoints are legal.
These guidelines were outlined in a landmark court case, Ingersoll vs. Palmer. Essentially, there must be a neutral or random screening process which limits the discretion of the officers in deciding who to stop. The intrusiveness on individual motorists must be limited. The detention of motorists is brief, encompassing only a few questions which allow the officer to observe objective signs of intoxication. In addition, officers will shine their flashlights into the vehicle in order to observe any alcoholic beverages. The Supreme Court has ruled that this intrusion on the individual is slight in comparison to the value to society in keeping drunk drivers off the road. "
No, you can't be coerced into surrendering your constitutional rights, but you can consent to waive them, which can (an often is) part of the bargain for permission to do something (e.g. board an aircraft). The conditions for obtaining a permit (or license) do vary from permit to permit (driving has a more rigorous set of requirements than fishing), but in any event, the permit doesn't belong to you, it's the property of the issuing agency, which means they can require you to carry it with you when engaged in the permitted activity, show it to LEO when asked (assuming the proper criteria are met), revoke or suspend it if you don't comply with the rules, and of course, require you to pay a fee to get it. In short, these "papers" aren't secured by the 4th amendment, and a warrant isn't required to examine them. (However, a warrant may be required to conduct a search for them.) Some of the hunters on this forum could probably curl your hair with tales of conduct by Conservation Officers.
You have the freedom to decline any of these permits. How did that line go in "War Games"? "The only winning move is not to play".