Cross-mot. for Summ. J. at 8.) Indeed, the Attorney General uses the expression “probable cause” interchangeably with “reasonable and articulable suspicion” at several points. Id.
We find it necessary to observe that even though the plaintiffs contend that the Seatbelt Enforcement Act violates art. I, § 11, of the Indiana Constitution, both they and the Attorney General largely use federal 'Fourth Amendment analysis and authority in pressing their arguments. But in Brown v. State, 653 N.E.2d 77 (Ind.1995), this Court enunciated a separate and distinct method of analysis for claims of search and seizure violations of the state constitution. Rather than employ federal concepts like the warrant requirement and probable cause requirement, we require instead that the State bear the burden of showing that, in the totality of the circumstances, the intrusion was reasonable. Id. at 79-80.
Since Broion, we have not had an occasion to define further the reasonableness requirement. However, shortly before we decided Brown, Judge Kirsch of the Court of Appeals, applying independent state constitutional analysis, examined the question of whether a brief police detention of an individual violated art. I, § 11. Taylor v. State, 639 N.E.2d 1052, 1054 (Ind.Ct.App.1994). As we were to do in Brown, Judge Kirsch found that the constitutional provision required the detention to be reasonable. He went on to conclude that a brief police detention of an individual during investigation is reasonable if the officer reasonably suspects that the individual is engaged in, or about to engage in, illegal activity. Reasonable suspicion exists where the facts known to the officer, together with the i’easonable inferences arising from such facts, would cause an ordinarily prudent person to believe that criminal activity has or is about to occur. Taylor, 639 N.E.2d at 1054. We find Taylor comports with Brown.
Applying these principles of Indiana constitutional law to the case before us, we hold that a police officer may not stop a motorist in Indiana for a possible seat belt violation unless that officer reasonably suspects that the driver or a passenger in the vehicle is not wearing a seat belt as required by law. This reasonable suspicion exists where the officer observes the driver or passenger under circumstances (e.g., bodily movement, distance, angle, lighting, weather) that would cause an ordinary prudent person to believe that the driver or passenger is not wearing a seat belt as required by law.
B
The fact that the police cannot stop a motorist without the reasonable suspicion required by art. I, § 11, however, does not render the Seatbelt Enforcement Act unconstitutional. For two reasons, we hold that it is constitutional.
B-l
The Plaintiffs contend that the Seat-belt Enforcement Act is unconstitutional on its face. When a party claims that a statute is unconstitutional on its face, the claimant assumes the burden of demonstrating that there are no set of circumstances under which the statute can be constitutionally applied. Reno v. Flores, 507 U.S. 292, 301, 113 S.Ct. 1439, 123 L.Ed.2d 1 (1993); United States v. Salerno, 481 U.S. 739, 745, 107 S.Ct. 2095, 95 L.Ed.2d 697 (1987). Although we have never explicitly said that this principle applies to state constitutional analysis as well as federal, we have suggested as much. See State v. Sproles, 672 N.E.2d 1353, 1360 (Ind.1996); Citizens Nat’l Bank of Evansville v. Foster, 668 N.E.2d 1236, 1242 (Ind.1996). We now so hold.
As discussed above, art. I, § 11, prohibits police stops of motorists except on the reasonable suspicion required by Brown and Taylor. The Seatbelt Enforcement Act does not — indeed, as a matter of bedrock constitutional law cannot — -relieve the police from the obligations of art. I, § 11. So long as the police comply with art. I, § 11, the Seatbelt Enforcement Act can be constitutionally applied. It is not unconstitutional on its face.
B-2
A second way of analyzing this problem produces the same result. In our