A problem is that the evasive maneuver a driver takes to avoid a checkpoint may itself be illegal. Here's a typical example from a recent federal case out of the 4th Circuit, U.S. v. Scheetz, 293 F.3d 175 (4th Cir. 2002):
The facts concerning the stop of Scott Brooks's car in July 1998 are as follows. On July 10, 1998, the New Hanover County Sheriff's Department conducted a checkpoint in Wrightsville Beach, North Carolina. The law enforcement officers erected two signs on Salisbury Street visible to eastbound motorists approaching the check-point. Both signs read "K-9 CHECK POINT AHEAD" and were placed approximately 100 feet apart. (J.A. 95). The checkpoint itself--where law enforcement officers actually were stopping motorists--was visible from the location of the first sign.
The operational plan to be implemented by the checkpoint was two-fold. Law enforcement officers stationed at the checkpoint itself were to request and examine motorists' driver's licenses and vehicle registration cards and be alert for impaired drivers. In addition, narcotics officers observing from unmarked vehicles nearby were to watch for motorists who threw items out of their vehicles or who made u-turns or other evasive actions upon seeing the "K- 9 CHECK POINT AHEAD" signs. The narcotics officers planned to investigate any vehicle involved in such conduct.
The narcotics officers were seated in unmarked police vehicles on Pelican Drive just beyond the first checkpoint sign and about 100 feet from the checkpoint itself. Pelican Drive runs parallel to Salisbury Street and the two streets are separated by a grass median. Crossing the median is not permitted, as indicated by double yellow lines on Salisbury Street.
Although the two signs alerted motorists that there was a "K-9 CHECK POINT AHEAD," in fact, there was no K-9 officer at the checkpoint. A K-9 officer was present and available to assist, however, in a vehicle parked near the narcotics officers who were observing the activities from Pelican Drive.
The narcotics officers stationed on Pelican Drive observed a burgundy Pontiac Grand Am approach the checkpoint signs *183 and then execute an illegal u- turn across the grass median after passing the first checkpoint sign but before reaching the checkpoint itself. Upon observing that conduct, the narcotics officers pursued the Grand Am and executed a stop.
Three narcotics officers approached the stopped car. Narcotics officers Almeida and Kennedy approached the driver's side and requested a driver's license and vehicle registration card from the driver, Scott Brooks. Narcotics officer Blackmon approached the passenger's side and immediately signaled to narcotics officers Almeida and Kennedy that he smelled the odor of marijuana emanating from the interior of the car. Narcotics officers Almeida and Kennedy smelled the same strong odor at the same time.
Upon smelling the odor of marijuana, the narcotics officers directed Scott Brooks to step out and stand at the rear of the car. The narcotics officers sought Scott Brooks's consent to search the car but Scott Brooks declined to give his consent. Based on the strong odor of marijuana emanating from the car, the narcotics officers conducted a search of the car, and, during the search, narcotics officer Kennedy discovered marijuana in a knapsack inside the car. Upon the discovery of the marijuana, the narcotics officers arrested Scott Brooks and conducted a search of his person during which they recovered and seized $2,725.
[2] According to Scott Brooks, the district court erred in allowing into evidence the evidence seized following the stop of his car because the stop of his car was part of a checkpoint whose primary purpose was drug interdiction, and, therefore, the checkpoint was unconstitutional. City of Indianapolis v. Edmond, 531 U.S. 32, 44, 121 S.Ct. 447, 148 L.Ed.2d 333 (2000) (holding that a checkpoint whose primary purpose is drug interdiction is unconstitutional). In making this argument, Scott Brooks posits that the government should not be permitted to use his illegal actions in seeking to avoid the illegal checkpoint as a basis to justify the stop.
[3] [4] We find nothing improper with respect to the stop and subsequent search of Scott Brooks's car and person. Because of his vehicular flight prior to arriving at the checkpoint, Scott Brooks was not seized for Fourth Amendment purposes by the show of police authority by virtue of the checkpoint signs or the checkpoint itself. California v. Hodari D., 499 U.S. 621, 626-29, 111 S.Ct. 1547, 113 L.Ed.2d 690 (1991) (no seizure for Fourth Amendment purposes when a defendant did not acquiesce in the show of police authority); id. at 629, 111 S.Ct. 1547 ("Assuming that [the officer's] pursuit ... constituted a 'show of authority' in enjoining Hodari to halt, since Hodari did not comply with that injunction he was not seized until he was tackled."); Brower v. County of Inyo, 489 U.S. 593, 599, 109 S.Ct. 1378, 103 L.Ed.2d 628 (1989) (holding that for purposes of determining whether the roadblock worked a Fourth Amendment seizure, the controlling considerations are whether: (1) the motorist "was meant to be stopped by the physical obstacle of the roadblock"; and (2) the motorist "was so stopped"); Latta v. Keryte, 118 F.3d 693, 700 (10th Cir.1997) (holding that a fleeing motorist was not seized for Fourth Amendment purposes until the law enforcement officers were successful in stopping the motorist at a roadblock); Bella v. Chamberlain, 24 F.3d 1251, 1256 (10th Cir.1994) (holding that, unless the law enforcement officer's show of authority succeeds in restraining a person, the person has not been seized within the meaning of the Fourth Amendment). Consequently, Scott Brooks's commission of a traffic infraction provided a basis for the stop of his car. *184 Whren v. United States, 517 U.S. 806, 810, 116 S.Ct. 1769, 135 L.Ed.2d 89 (1996) ("As a general matter, the decision to stop an automobile is reasonable where the police have probable cause to believe that a traffic violation has occurred."). Once the car was properly stopped and the narcotics officers smelled marijuana, the narcotics officers properly conducted a search of the car. United States v. Morin, 949 F.2d 297, 300 (10th Cir.1991) (holding that, because marijuana has a distinct smell, "the odor of marijuana alone can satisfy the probable cause requirement to search a vehicle or baggage"). Finally, the money found on Scott Brooks's person was properly admitted as evidence seized pursuant to a lawful arrest. Chimel v. California, 395 U.S. 752, 762-63, 89 S.Ct. 2034, 23 L.Ed.2d 685 (1969) (holding that a search incident to a lawful arrest does not violate the Fourth Amendment); United States v. Nelson, 102 F.3d 1344, 1346 (4th Cir.1996) (same). Accordingly, the district court did not err when it denied Scott Brooks's motion to suppress.