Summary

William J. Brennan, Jr. Wong Sun v. United States — Opinion of the Court

Without scrutinizing the contents of Toy's ambiguous recitals, we conclude that no reference to Toy in Wong Sun's statement constitutes admissible evidence corroborating any admission by Toy. We arrive at this conclusion upon two clear lines of decisions which converge to require it. One line of our decisions establishes that criminal confessions and admissions of guilt require extrinsic corroboration; the other line of precedents holds that an out-of-court declaration made after arrest may not be used at trial against one of the declarant's partners in crime.
Source: Wikisource

William J. Brennan, Jr. Wong Sun v. United States — Opinion of the Court

To hold that an officer may act in his own, unchecked discretion upon information too vague and from too untested a source to permit a judicial officer to accept it as probable cause for an arrest warrant, would subvert this fundamental policy.
The Government contends, however, that any defects in the information which somehow took the officers to petitioner Toy's laundry were remedied by events which occurred after they arrived.
Source: Wikisource

William J. Brennan, Jr. Wong Sun v. United States — Opinion of the Court

We intimate no view one way or the other as to whether the trial judge might have found in the narcotics alone sufficient evidence to corroborate Wong Sun's admissions that he delivered heroin to Yee and smoked heroin at Yee's house around the date in question. But because he might, as the factfinder, have found insufficient corroboration from the narcotics alone, we cannot be sure that the scales were not tipped in favor of conviction by reliance upon the inadmissible Toy statement.
Source: Wikisource

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