Appellant appeals his conviction of possession of cocaine, D.C.Code § 33-541(d) (1985 Supp) on the ground that cocaine was found as the result of an impermissible inventory search of the car he was driving by the U.S. Capitol Police, and therefore should have been suppressed as an unconstitutional seizure. He also contends his oral statement about the drugs following the search should have been suppressed. We affirm.
I
At approximately 12:52 a.m. a United States Capitol Policeman noticed that appellant was driving a car without its headlights and had driven through several red lights, one at First and E Streets, the second light on New Jersey Avenue, and the third at South Capitol and Canal Streets. The officer stopped appellant in the 600 block of South Capitol Street, S.W. at Virginia Avenue, and when he was unable to produce a license and registration, determined, following a computer check, that the license tags on the car had expired and did not match the registration in appellant’s name. Appellant explained that he had taken the car from his place of employment, an auto repair shop, and put his license tags on the car, but did not know who owned the car. Following a breathal-izer test, which he failed, appellant was charged with driving while intoxicated and other traffic offenses. He and the car were transported to the police station.
When the Capitol Police were unable to determine ownership of the car, they decided to impound it. An inventory search of *281 the car followed and revealed under the front passenger seat a large amount of cash, a plastic bag of white powder and another bag containing a weed-like substance; the white powder was subsequently determined to be cocaine and the weed-like substance was determined to be marijuana. The officer who performed the inventory search checked the entire interior of the vehicle. Although the U.S. Capitol Police do not have written guidelines for such searches, the officer testified that he had been trained by his supervisors to perform inventory searches in this manner and he did so in accordance with standard operating procedures.
II
An inventory search of an automobile is permissible only if the authorities lawfully possess the vehicle. Lawful possession exists where there is statutory or regulatory authority for impoundment of a vehicle, the police have probable cause to believe that the car contains contraband, or a person consents to such possession or is unable to make other arrangements for disposition of the automobile.
Arrington v. United States,
Appellant was arrested on Capitol Grounds.
1
Officer McCumber testified that it was the policy of the Capitol Police to impound a vehicle for safekeeping if ownership of the vehicle is unknown. Since the police could not determine following appellant’s arrest for traffic violations whether he was an authorized user of the car or who owned the car, the police legitimately exercised their “community care-taking functions” when they impounded the car.
Opperman, supra,
An inventory search taken to protect a car lawfully within police custody is presumptively reasonable if conducted pursuant to standard operating procedures.
*282
Opperman, supra,
Ill
Appellant also contends that his oral statement to police after the inventory search should have been suppressed. He contends the Miranda
4
warnings which were given to him did not break the causal connection between the Fourth Amendment violation and his statement. He relies on
Brown v. Illinois,
Since the inventory search was lawful, appellant’s contention that there was no break in the chain of causality between the search and his statement must fail. In addition, the trial court heard undisputed testimony that appellant was initially advised of his rights and stated he understood them and was readvised at the sta-tionhouse where he executed a written waiver. The arresting officer testified appellant appeared to understand his rights, although he might have been intoxicated when arrested. At least one hour later at the station, appellant indicated he had previously been advised of his rights.
Upon review of whether appellant voluntarily waived his
Miranda
rights, we must determine whether the trial court’s findings of fact have substantial support in the record and whether the trial court erred as a matter of law.
Cf. Miller v. Fenton,
— U.S. —,
But even if the trial court erred in denying appellant’s motion to suppress, the error was harmless.
Chapman v. California,
Accordingly, the judgment is affirmed.
Affirmed.
Notes
. See Metropolitan Police Department General Order No. 310.1 D.l. and Attachment A to Metropolitan Police Department General Order No. 310.1 (Map showing Properties Under the Jurisdiction of the Architect of the Capitol).
. The government has not challenged appellant’s standing to contest the impoundment and search.
See Hill v. United States,
.
Smith v. State,
.
Miranda v. Arizona,
