In what circumstances will a court order suppression of evidence discovered after the issuance of a search warrant?

Leaving aside for the moment the question of the evidence discovered upon the unlawful entry into the apartment, see C. infra, we turn to the question of the evidence discovered in the apartment after the issuance of the search warrant. The district court found that the warrant itself was valid, but ruled that the illegality of the initial entry, coupled principally with the unreasonableness of the delay in obtaining the warrant, required the suppression of the evidence discovered after the warrant was issued. We conclude that our prior decision in United States v. Agapito, supra, is controlling and requires the contrary result.