Several days later, Wong Sun voluntarily returned to the police station to make a statement, during the process of which he confessed.

In a trial in a Federal District Court without a jury, they were convicted of fraudulent and knowing transportation and concealment of illegally imported heroin, in violation of 21 U.S.C.

Although the Court of Appeals held that the arrests of both petitioners without warrants were illegal, because not based on "probable cause" within the meaning of the Fourth Amendment nor "reasonable grounds" within the meaning of the Narcotics Control Act of 1956, it affirmed their convictions.

The Supreme Court held that: Toy's statements and the discovered drugs at Jonny's should both be excluded as fruit of the poisonous tree because the search was done without a warrant.

Wong Sun's statement was ruled admissible because he had no standing to move to suppress the evidence found in Jonny's apartment.