What does the 1990 Supreme Court case out of Michigan which found sobriety checkpoints did not constitute a violation of the fourth amendment require, explicitly or implicitly as the case may be, in terms of law enforcement agencies announcing or publicizing their planned checkpoints in advance?
Does it require agencies or departments to publish in advance the specific time, location and purpose of checkpoints in advance?
Does it require agencies or departments to announce that checkpoints will be operated within some jurisdiction over some period of time?
Does it not require but suggest either of the above?
Bonus question - does some other national/federal authority (e.g., the NHTSA, DOJ, newer court cases, etc.) have any rules, regulations or guidelines that govern local and state law enforcement agencies' operation of sobriety checkpoints?