Below are cases that prove points of law and constitutional rights:
Case point: No requirement to show ID if no criminal act has been committed:
One morning in late September 2005, Deb was riding the public bus to work. She was minding her own business, reading a book and planning for work, when a security guard got on this public bus and demanded that every passenger show their ID. Deb, having done nothing wrong, declined. The guard called in federal cops, and she was arrested and charged with federal criminal misdemeanors after refusing to show ID on demand.
The U.S. supreme court case of Brown v. Texas, 443 US 47 (1979) threw out a Texas law which required the showing of ID on demand & refers to other supreme court cases:
Held: The application of the Texas statute to detain appellant and require him to identify himself violated the Fourth Amendment because the officers lacked any reasonable suspicion to believe that appellant was engaged or had engaged in criminal conduct. Detaining appellant to require him to identify himself constituted a seizure of his person subject to the requirement of the Fourth Amendment that the seizure be "reasonable." Cf. Terry v. Ohio, 392 U.S. 1; United States v. Brignoni-Ponce, 422 U.S. 873.
The Fourth Amendment requires that such a seizure be based on specific, objective facts indicating that society's legitimate interests require such action, or that the seizure be carried out pursuant to a plan embodying explicit, neutral limitations on the conduct of individual officers.
Delaware v. Prouse, 440 U.S. 648. Here, the State does not contend that appellant was stopped pursuant to a practice embodying neutral criteria, and the officers' actions were not justified on the ground that they had a reasonable suspicion, based on objective facts, that he was involved in criminal activity. Absent any basis for suspecting appellant of misconduct, the balance between the public interest in crime prevention and appellant's right to personal [443 U.S. 48] security and privacy tilts in favor of freedom from police interference.
The lady in Denver could also file a "Bivens" action against federal agents & a Title 42, Sec. 1983 action against State agents. I see the article said the ACLU took the lady's case & they should have a field day with it.