Opinion by Judge HALL; Dissent by Judge WIGGINS.

We are called upon to decide whether the police used an alleged parking violation as a pretext to search for evidence of an unrelated, more serious offense. We hold that the stop was pretextual and that the district court erred by failing to suppress the fruits of the search.

I.

At the time of the arrest, appellant Pedro Hernandez was on. parole from state prison for a felony drug conviction. He attracted the attention of local police, who were aware of his conviction and suspected that he once •again was involved in illegal drug activity.

Officer Lon Bomar of the Montana Highway Patrol was patrolling Interstate 90 when he noticed Hernandez driving a Chevrolet car on a frontage road parallel to the interstate. Officer Bomar suspected that Hernandez was speeding but could not clock his speed, so he turned off the interstate and followed him on the frontage road.

Officer Bomar spotted Hernandez’s Chevrolet parked on Scott Street, an unpaved street just off the interstate. It was parked behind a Cadillac in which Hernandez and a man later identified as Anthony Kim Martinez were sitting. Both ears were parked on the right hand side of the street, within a foot or two of some bushes growing along the side of the road. The cars were not blocking traffic; plenty of room - remained for other vehicles to pass. Officer Bomar pulled up behind Hernandez’s Chevrolet, turned on his emergency flashers, called for backup, and left his vehicle to investigate. He later testified that he wanted “to see if there was a reason they were parked- on the roadway, or if one of the vehicles had broken down and w[as] in need of assistance.”

Officer Bomar asked Martinez why he was parked there. Martinez said that he and Hernandez had just met to talk. Officer Bomar decided to cite both vehicles for parking violations. He later admitted that he had no other cause to detain or investigate the two men.

*445 When officer Bomar’s backup arrived, the officers questioned the two men and searched their vehicles. They found $4,700 in cash, approximately fifteen pounds of marijuana, and a loaded handgun which later turned out to be stolen. They then decided to search Hernandez's residence, where they found ammunition that appeared to match the stolen gun and a substantial amount of cash.

A federal grand jury indicted Hernandez on one count of conspiracy to possess with intent to distribute marijuana in violation of 21 U.S.C. §§ 841 (a)(1) and 846 and 18 U.S.C. § 2 (Count I), one count of possession with intent to. distribute marijuana in violation of 21 U.S.C. § 841 (a)(1) and 18 U.S.C. § 2 (Count II), one count of possession of a firearm during a drug trafficking crime in violation of 18 U.S.C. § 924 (c)(1) (Count III), and one count of being a felon in possession of a firearm in violation of 18 U.S.C. § 922 (g)(1) (Count IV). 1

Hernandez moved to suppress the evidence, claiming that the searches violated his Fourth Amendment rights. The district court denied the motion. A jury found him guilty on Counts I and IV. The court sentenced him to 120 months and a supervised release term of four years. He now appeals.

II.

Hernandez contends that the initial stop was illegal because officer Bomar used an alleged parking infraction as a pretext to search for evidence of Hernandez’s drug involvement. He argues that all evidence found during the stop, as well as that later collected at his residence, should have been suppressed as the fruit of an illegal search and seizure. We agree.

We begin our analysis from the premise that our pretextual stop doctrine does not prohibit the use of evidence serendipitously gathered as part of a legitimate traffic stop. Rather, “ ‘[a] pretextual stop occurs when the police use a legal justification to make the stop in order to search a person or place, or to interrogate a person, for an unrelated serious crime for which they do not have the reasonable suspicion necessary to support a stop.’” United States v. Cannon, 29 F.3d 472, 474 (9th Cir.1994) (quoting United States v. Guzman, 864 F.2d 1512, 1515 (10th Cir.1988)).

Rather than examining the subjective motivations of individual officers, we apply an objective “reasonable officer” test to determine whether a particular stop is pretextual. 2 Cannon, 29 F.3d at 475-76 (surveying Ninth Circuit case law and concluding that our pretextual stop doctrine employs an objective test). We focus on the objective facts and ask whether a reasonable officer, given the circumstances, would have, made the stop absent a desire to investigate an unrelated serious offense. Id. at 476 ; Guzman, 864 F.2d at 1517 (citing United States v. Smith, 799 F.2d 704, 709 (11th Cir.1986)). In making this inquiry, we often find it helpful to determine whether the stop conformed' to regular police practices. See Cannon, 29 F.3d at 476; Guzman, 864 F.2d at 1518 (remanding for determination of whether New Mexico police routinely stop seat belt violators).

*446 The government argues that the police would have stopped Hernandez to cite him for a parking violation, even absent a desire to search for contraband. This argument fails because no reasonable officer would have suspected that Hernandez was parked illegally under Montana law.

Hernandez and Martinez were cited for violating Mont.Code Ann. § 61-8-353, which provides, in relevant part:

Mont.Code Ann. § 61-8-353(1) (1993) (emphasis added). By its very terms, this provision applies only to vehicles parked on a “highway outside of a business or residence district.” Id. (emphasis added). It does not, in other words, apply to vehicles parked within a business or residence district.

The district court found that Hernandez and Martinez parked their vehicles squarely within a business district as defined by the motor vehicle code. 3 This finding is not ■clearly erroneous. See United States v. Becker, 23 F.3d 1537, 1539 (9th Cir.1994) (reviewing factual findings for clear error). Officer B ornar testified at the suppression hearing that the vehicles were parked “right next to ... Louie and Dean’s Truck Salvage” on Scott Street. In addition, Leslie Frank, who managed Orr’s Truck Salvage on Scott Street, and James Schmid, a local businessman, described Scott Street as an industrial district, with various businesses located up and down the street from where the vehicles were parked. Finally, photographs introduced at trial make absolutely clear that Scott Street is located within a business district as contemplated by Mont.Code Ann. § 61-1-408.

Although we accept the district court’s finding that Scott Street was located with'in a business district, we cannot agree with the district court’s conclusion that the stop was not pretextual. See Becker, 23 F.3d at 1539 (reviewing legal conclusions de novo). We must presume that a reasonable officer knows the law he is charged with enforcing. Montana law does not prohibit parking on the side of a street in a business district. No reasonable officer would stop a motorist for illegally parking on a street outside of a business district when the motorist is parked “right next to” several businesses. The government has offered no other legitimate reason for the stop and, after reviewing the record, we find none.

Under these circumstances, we can only conclude that a reasonable officer in Bomar’s position would not have stopped Hernandez absent a desire to investigate his suspicions of illegal drug activity. We therefore hold that the stop was pretextual. See United States v. Millan, 36 F.3d 886, 889 (9th Cir.1994) (concluding that traffic stop for driving with a cracked windshield was pretextual because state law did not prohibit driving with a cracked windshield and government did not establish any other legitimate reason for the stop); cf. United States v. Lillard, 929 F.2d 500, 502 (9th Cir.1991) (stop was not pretextual because even though officers suspected defendant of drug trafficking, they would have made the stop anyway because defendant was carelessly speeding in violation of state law).

We are not dissuaded by the fact that Hernandez was actually involved in illegal drug activity. “[Tjhere is nothing new in the realization that the Constitution sometimes *447 insulates the criminality of a few in order to protect the privacy of us all.” Arizona v. Hicks, 480 U.S. 321, 329 , 107 S.Ct. 1149, 1155 , 94 L.Ed.2d 347 (1987) (Sealia, J.).

The consequence of finding that the stop was pretextual is that all tainted evidence must be excluded. Wong Sun v. United States, 371 U.S. 471, 487-88 , 83 S.Ct. 407, 417-18 , 9 L.Ed.2d 441 (1963). We conclude that the interrogation of Hernandez and Martinez and all subsequent searches resulted directly from the pretextual stop. 4 All evidence gathered as a result was tainted and should have been suppressed. See Millan, 36 F.3d at 890 (excluding all evidence that was the “fruit” of an illegal search). We so hold. 5

REVERSED and REMANDED.

. Martinez was named in counts I and II of the same indictment. Martinez pled guilty and later testified as a government witness at Hernandez’s trial.

. The subjective intentions of an officer, of them-selyes, do not turn a legitimate stop into an unconstitutional search and seizure. A stop is' not pretextual because the stopping officer secretly hopes to find evidence of greater wrongdoing; rather, a stop is pretextual because the facts of a case suggest that a reasonable officer would not have pursued the minor offense absent a desire to investigate an unrelated, more serious offense. Cannon, 29 F.3d at 474 ; Guzman, 864 F.2d at 1517-18 .

Any suggestion to the contrary in United States v. Millan, 36 F.3d 886 (9th Cir.1994), is beside the point, because all three members of the Mil-lan Court analyzed the pretextual stop issue according to the "reasonable officer” standard and concluded that the stop in question was objectively pretextual. 36 F.3d at 889-90 ; id. at 890-91 (Hall, J., concurring). Similarly, although the majorhy in.United States v. Perez, 37 F.3d 510 (9th Cir.1994), found the case law confusing, it also analyzed the pretextual stop inquiry according to our objective "reasonable officer” standard. Id. at 513 (concluding that “any reasonable officer would have made the stop under the circumstances present here”).

. The district court found that ‘‘[t]he vehicles were parked on a roadway next to a business property.”

MontCode Ann. § 61-1-408 (1993).

. One of the officers admitted at the suppression hearing that all searches resulted from the initial stop.

. Because we hold that the evidence in this case should have been excluded as the fruit of a pretextual stop, we do not address appellant’s other arguments.