Baldwin was convicted and sentenced to one year in prison, following which he appealed the case, arguing that the Sixth Amendment to the United States Constitution granted him the right to a jury trial.

The majority opinion, authored by Justice Byron White, noted that in 49 of the 50 states, "petty offenses" were punishable by no more than one year in jail.

Therefore, a crime with a possible two-year sentence was out of step with the common law definition of "petty" thus necessitating a right to trial by jury.

[3] The majority opinion, authored by Justice Byron White, narrowed the decision of Duncan v. Louisiana by holding that a right to a jury trial is required for all crimes where the penalty exceeds six months imprisonment.

The opinion explicitly disagreed with the prosecution's argument that the line should be drawn between misdemeanor and felony, and noted that every other state had reduced punishment for non-jury trials to no more than six months.