S.D.Fla.: Difference between a stop based on mistakes of law and of fact

Claimant’s stop was based on reasonable suspicion of a traffic violation, and there was no mistake of law or fact. The court discusses the difference. United States v. $33,020.00 in United States Currency, 2010 U.S. Dist. LEXIS 53550 (S.D. Fla. June 1, 2010)*:

a. Mistakes of Law

Twilley [United States v. Twilley, 222 F.3d 1092, 1094 (9th Cir. 2000)] illustrates the situation where reasonable suspicion for a traffic stop was lacking because of a mistake of law. In Twilley, a California Highway Patrol officer spotted a vehicle with a Michigan license plate on the rear. The officer mistakenly believed that Michigan law required a license plate on the front of the vehicle in addition to the license plate on the rear. It was the officer’s basis for stopping the vehicle. However, the officer was wrong as a matter of law. Michigan law did not require display of a front license plate. Consequently, the Ninth Circuit held that the officer did not have reasonable suspicion, the traffic stop violated the Fourth Amendment, and evidence from the search that followed should be suppressed. Id.

b. Mistakes of Fact

United States v. Wallace, 213 F.3d 1216 (9th Cir. 2000), illustrates the opposite situation. In Wallace, as in the present case, police officers were following a vehicle that was suspected of involvement with illegal narcotics activity. The officers were hoping to see a traffic violation in order to stop the driver. The officer noticed that the front window glass of the target car was darkly tinted. California’s Vehicle Code prohibits dark tinted windows on the front part of a car. Specifically, any tinting darker than tinted glass which allows 70% light transmittance is prohibited by California law.

Based upon the dark tinting, the police officer pulled Wallace over and the ensuing search of his vehicle revealed 130 pounds of marijuana. The officer correctly believed that the vehicle code prohibited dark tinting. That he incorrectly believed that all tinting was prohibited, or that he had not precisely measured the light transmitting quality of the window glass (which was later measured as only 29%), was of no moment. In holding that the officer had objective, probable cause justifying the traffic stop, the Ninth Circuit explained that the officer “was not taking the bar exam.” Id. at 1220. Instead, the issue, “is not how well [the officer] understood California’s window tinting laws, but whether he had objective, probable cause to believe that these windows were, in fact, in violation.” Wrote the court, “Officer Lieber’s observations correctly caused him to believe that Wallace’s window tinting was illegal; he was just wrong about exactly why.” Id. Consequently, the Ninth Circuit reversed, holding that the motion to suppress should be denied. Id. at 1221.

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