Specifically, the Supreme Court has held that no offense can be deemed ' petty for purposes of the right to trial by jury where imprisonment for more than six months is authorized. No jury trial was required when the trial judge suspended sentence and placed defendant on probation for three years. There is a presumption that offenses carrying a maximum imprisonment of six months or less are petty, although it is possible that such an offense could be pushed into the serious category if the legislature tacks on onerous penalties not involving incarceration