Alvaro Arciniega conditionally pleaded guilty to possession with intent to distribute cocaine, in violation of 21 U.S.C. § 841. He now appeals the district court’s 1 order denying his motion to suppress evidence. We affirm.
I.
In early February 2007, officers in the narcotics unit of the Omaha, Nebraska, Police Department received a tip that Arciniega was distributing cocaine out of his home and electronics business. Officer Mark Lang led the investigation, and with the help of a cooperating witness, Lang scheduled a targeted buy for February 27, 2007. At a briefing on the day of the buy, the other officers assigned to the case were informed that Arciniega would be driving a Green Dodge Durango. Officer Michael Bossman, a member of the canine unit, was instructed to drive his police cruiser to a location where he could intercept Arciniega.
At approximately 5:15 p.m. on February 27, the officers learned that Arciniega was headed toward the rendezvous point. Shortly thereafter, Officer Bossman saw a Green Dodge Durango that matched the description of Arciniega’s vehicle. Boss-man also noticed that there was a large oval air freshener hanging from the Durango’s rearview mirror, which he recognized as a violation of a state traffic law prohibiting view obstruction. He activated his emergency lights and initiated a traffic stop. Bossman told Arciniega that he had been stopped for illegal view obstruction and requested Arciniega’s driver’s license, registration, and insurance. Bossman then asked Arciniega to step over to the police cruiser to review the documents.
During the course of the stop, several other officers involved with the investigation arrived on the scene. Officer Gary Kula took over speaking with Arciniega while Bossman started walking his canine around the Durango. Using a mixture of Spanish and English, Kula told Arciniega that the police were conducting a narcotics investigation and asked if he was willing to cooperate. Arciniega appeared to understand the question and nodded yes. Arciniega read and signed a Spanish consent-to-search form for his vehicle and thereafter observed the vehicle search without objection. The officers found four ounces of cocaine underneath the front passenger seat of the vehicle.
After placing Arciniega in handcuffs, Officer Lang asked if he would consent to a search of his electronics business, to which Arciniega replied “go ahead, okay.” The officers escorted Arciniega to the business, where they waited approximately thirty minutes for the arrival of Officer Edith Andersen, a Spanish-speaking translator. Because Arciniega’s wife and child were present, Andersen and Lang took Arciniega into a restroom to talk privately. Speaking in Spanish, Andersen asked Arciniega if he would consent to a search of the business and his residence, and he agreed. Arciniega also signed an English consent-to-search form that Andersen ex *397 plained. The searches revealed several incriminating items, including more than $26,000 in cash and materials used for packaging illegal narcotics.
II.
On an appeal from a denial of a motion to suppress evidence, we review the district court’s factual findings for clear error and its legal conclusions
de novo. United States v. Lopez-Vargas,
A.
Arciniega first contends that the district court abused its discretion in refusing to authorize a subpoena duces tecum for all previous traffic citations issued by Officer Bossman under Nebraska’s view obstruction statute. During Arciniega’s suppression hearing, Bossman estimated that he had made several hundred traffic stops for view obstruction. He also testified that he does not always issue tickets for these violations, and he stated that on many occasions he has not stopped drivers with objects hanging from their rearview mirrors. Arciniega sought to subpoena records from Bossman’s prior traffic stops on the ground that the records would allow him to establish that the stop in his case was based on an impermissible motive.
“A district court may, in its discretion, determine that the burden of producing subpoenaed records greatly outweighs any relevance they may have to the case.”
United States v. Roach,
B.
Arciniega also argues that Nebraska’s windshield obstruction statute is unconstitutionally vague because it is not
*398
clear when an obstruction is significant enough to violate the law. In rejecting a similar argument, we explained that “[t]he plain language of the statute unambiguously provides that ‘any object’ that obstructs a clear and full view through the windshield violates Nebraska law.”
United States v. Ramos-Caraballo,
C.
Finally, Arciniega argues that the district court erred in finding that he voluntarily consented to the searches of his vehicle, electronics business, and residence. Whether an individual’s consent is voluntary is a question of fact that must be determined from the totality of the circumstances.
United States v. Smith,
At the time of the searches, Arciniega was an adult with no history of mental or psychological impairments. He was not under the influence of drugs or alcohol, and there is no indication that he was threatened or coerced. Although Arciniega contends that the police misrepresented the purpose of the traffic stop, the record shows that Officer Kula informed Arciniega that the officers were conducting a narcotics investigation. As recounted above, using a mixture of Spanish and English, Kula requested Arciniega’s permission to search the vehicle, following which Arciniega read and signed a Spanish consent form and raised no objection as the police conducted the search. The record therefore supports the conclusion that Arciniega voluntarily consented to the search of his vehicle.
The voluntariness of Arciniega’s subsequent consent to the search of his home and business presents a slightly
*399
closer question. After finding cocaine in the vehicle, the officers placed Areiniega in handcuffs and Officer Lang asked if he would cooperate in a search of his electronics business, to which Areiniega agreed. Lang and Andersen, the Spanish-speaking translator, later spoke with Arciniega in a restroom at the business, at which time he consented to a search of the business and his residence. Areiniega contends that his consent was involuntary because he was not informed of his
Miranda
rights until after the search and because the interview was conducted in a private area. Although
Miranda
warnings may decrease the likelihood that consent has been subtly coerced, they are not required to establish voluntariness.
United States v. Lee,
The judgment is affirmed.
Notes
. The Honorable Laurie Smith Camp, United States District Judge for the District of Nebraska, adopting the report and recommendation of the Honorable F.A. Gossett, United States Magistrate Judge for the District of Nebraska.
. Although Arciniega vaguely suggests that the traffic records might have allowed him to establish a violation of his right to equal protection, he has not made the initial "credible showing of different treatment of similarly situated, persons” necessary to support discovery for this type of claim.
See United States v. Armstrong,
