What follows is an opinion from the Supreme Court of the United States. Your task is to determine the bases on which the Supreme Court rested its decision with regard to the legal provision that the Court considered in the case. Consider "judicial review (national level)" if the majority determined the constitutionality of some action taken by some unit or official of the federal government, including an interstate compact. Consider "judicial review (state level)" if the majority determined the constitutionality of some action taken by some unit or official of a state or local government. Consider "statutory construction" for cases where the majority interpret a federal statute, treaty, or court rule; if the Court interprets a federal statute governing the powers or jurisdiction of a federal court; if the Court construes a state law as incompatible with a federal law; or if an administrative official interprets a federal statute. Do not consider "statutory construction" where an administrative agency or official acts "pursuant to" a statute, unless the Court interprets the statute to determine if administrative action is proper. Consider "interpretation of administrative regulation or rule, or executive order" if the majority treats federal administrative action in arriving at its decision.Consider "diversity jurisdiction" if the majority said in approximately so many words that under its diversity jurisdiction it is interpreting state law. Consider "federal common law" if the majority indicate that it used a judge-made "doctrine" or "rule; if the Court without more merely specifies the disposition the Court has made of the case and cites one or more of its own previously decided cases unless the citation is qualified by the word "see."; if the case concerns admiralty or maritime law, or some other aspect of the law of nations other than a treaty; if the case concerns the retroactive application of a constitutional provision or a previous decision of the Court; if the case concerns an exclusionary rule, the harmless error rule (though not the statute), the abstention doctrine, comity, res judicata, or collateral estoppel; or if the case concerns a "rule" or "doctrine" that is not specified as related to or connected with a constitutional or statutory provision. Consider "Supreme Court supervision of lower federal or state courts or original jurisdiction" otherwise (i.e., the residual code); for issues pertaining to non-statutorily based Judicial Power topics; for cases arising under the Court's original jurisdiction; in cases in which the Court denied or dismissed the petition for review or where the decision of a lower court is affirmed by a tie vote; or in workers' compensation litigation involving statutory interpretation and, in addition, a discussion of jury determination and/or the sufficiency of the evidence.

Opinion:
ANGELET v. FAY, WARDEN.
No. 578.
Argued March 11, 1965.
Decided June 7, 1965.
Leon B. Polsky argued the cause and filed a brief for petitioner.
Gray Thoron argued the cause for respondent. On the brief were Louis J. Lefkowitz, Attorney General of New York, Samuel A. Hirshowitz, First Assistant Attorney General, Barry Mahoney, Assistant Attorney General, and Michael H. Rauch and Brenda Soloff, Deputy Assistant Attorneys General.
Michael Juviler argued the cause for the National District Attorneys’ Association, as amicus curiae, urging affirmance. With him on the brief was H. Richard TJviller. Louis J. Lefkowitz, Attorney General of New York, Samuel A. Hirshowitz, First Assistant Attorney General, Barry Mahoney and Thomas F. O’Hare, Jr., Assistant Attorneys General, H. Richard Uvüler and Michael Juviler filed a supplementary memorandum on behalf of the National District Attorneys’ Association, as amicus curiae.
Mr. Justice Clark
delivered the opinion of the Court.
This is a companion case to No. 95, Linkletter v. Walker, ante, p. 618. Petitioner was convicted in a New York State court in 1951 for possession of narcotics with intent to sell. On December 21, 1950, two detectives attached to the Narcotics Squad of the New York City Police Department entered petitioner’s apartment by a door opened by a painter who was just leaving. They ignored the protest of petitioner and proceeded, without a warrant, to search the apartment. Upon entering, one of the officers called an agent of the Federal Bureau of Narcotics. After two federal agents arrived the local and federal officers made a thorough search of the apartment. One of the local officers found 54 cellophane envelopes, 106 empty capsules, a box of staples and a scale. A federal agent found four packages under a hat. Analysis revealed that three of the packets contained heroin and the other contained cocaine. These items were introduced in evidence at the state trial without objection of petitioner’s counsel. Nor was objection made to the participation of the federal narcotics agents in the investigation. After conviction petitioner filed a notice of appeal to the Appellate Division but the appeal was dismissed in March of 1952.
In August 1961, after Mapp v. Ohio, 367 U. S. 643, was decided, petitioner resorted to state post-conviction remedies claiming that the evidence found in his apartment and introduced against him had been illegally seized and that his conviction had therefore been obtained in violation of the Fourth and Fourteenth Amendments. Upon seeking habeas corpus in the United States District Court on the same grounds his application was denied. The trial judge refused to apply Mapp retrospectively. The Court of Appeals sitting en banc affirmed by a divided vote. 333 F. 2d 12. We granted certiorari, 379 U. S. 815 (1964), and set this case for argument with Linkletter, supra. That case answers petitioner’s point as to the retrospective application of Mapp.
However, petitioner also contends that the participation of federal narcotics agents in the search and seizure requires reversal here, citing Rea v. United States, 350 U. S. 214 (1956). We cannot agree. That case invoked the supervisory power of a federal court over a federal law enforcement officer and we held that the latter might be enjoined from appearing in a state trial for the purpose of offering evidence previously seized by him illegally as a federal officer and so found by a federal court. But even if an exclusionary rule were fashioned to bar use of the federal agent’s testimony in the absence of a federal court restraint, the petitioner would be entitled to no relief. Such an exclusionary rule would depend upon the reasons given in Mapp and under Linkletter, supra, would not have retrospective application.
Affirmed.
Mr. Justice Black and Mr. Justice Douglas would reverse the judgment of the Court of Appeals for the reasons stated in Mr. Justice Black’s dissenting opinion in Linkletter v. Walker, ante, p. 640.

Question: What is the basis of the Supreme Court's decision?

Choices:
judicial review (national level)
judicial review (state level)
Supreme Court supervision of lower federal or state courts or original jurisdiction
statutory construction
interpretation of administrative regulation or rule, or executive order
diversity jurisdiction
federal common law

Answer: 6