In January 1981, police officers in Belfast, Maine responded to a fire call at the Belfast Dodge automobile dealership and discovered a burning stolen Chevrolet dump truck along with evidence of several automobile thefts inside a building leased to Brian Moulton and his codefendant Gary Colson.
On April 7, 1981, a Waldo County grand jury indicted Moulton and Colson on four counts of theft by receiving stolen goods. Moulton and Colson, represented by retained counsel, pleaded not guilty on April 9 and were released on bail.
On November 4, 1982, Colson telephoned Police Chief Robert Keating to report anonymous threatening calls and expressed a desire to discuss the pending charges. After consulting his lawyer, Colson met with police on November 9 and 10, provided full confessions of his and Moulton's participation in the thefts and additional crimes including burglary and arson, and agreed to testify against Moulton and cooperate in the prosecution in exchange for no further charges. The police placed a recording device on Colson's telephone with instructions to record calls from Moulton or threats.
Colson recorded three telephone conversations with Moulton on November 22, December 2, and December 14, 1982, in which the men discussed the pending charges and arranged to meet on December 26 to plan their defense. On December 26, Colson wore a body wire transmitter to the meeting as arranged with the police, and the two discussed defense strategy including false alibis, during which Moulton made numerous incriminating statements about the thefts that were later admitted at trial.
Moulton moved to suppress the recorded statements before trial. The trial court denied the motion after finding the recordings were made to investigate threats and protect Colson. Moulton was convicted of burglary and theft following a bench trial.
The Maine Supreme Judicial Court reversed the convictions on the ground that the statements were obtained in violation of Moulton's Sixth Amendment right to counsel. The United States Supreme Court granted the State's petition for certiorari.