Wilson was charged with crimes related to the sale of illegal narcotics. Prior to trial, Wilson demanded contact information for a federal informant in order to establish a defense of entrapment. The prosecution offered only the address of the local office of the federal bureau of narcotics. Wilson moved to compel the prosecution to produce the informant for pretrial examination or, in the alternative, to compel the informant to appear as a witness. The court reserved a ruling on Wilson’s motion until after it had heard the trial evidence. At trial, a federal agent testified that he had given the informant cash and placed her on a train to another state. After the agent’s testimony, Wilson moved again to compel production of the informant. The court denied the motion upon a conclusion that the informant’s testimony would not be beneficial to Wilson. Wilson appealed her conviction through the state courts.