It is important to understand that a defendant is always entitled to a jury trial in a criminal case if the potential penalty for a conviction of the crime is more than six months. It does not matter if the judge is not likely to sentence the defendant to more than six months in jail or even if the judge says he/she will not do it. As long as the law allows for a sentence of more than six months in jail, the defendant can have a jury trial.
For instance, there was a case just south of Jacksonville, Duval County, Florida where a defendant was charged with possession of less than an ounce of marijuana. This is a misdemeanor crime, but as ridiculous as it may seem, it carries a potential penalty of a year in jail. The defendant wanted a jury trial, but the judge denied the request because he said he had no intention of sentencing the defendant to jail time if he was convicted of the crime. The defendant had his trial with the judge as the decision maker (referred to as a bench trial), the judge found him guilty and the judge sentenced him to no time in jail.
The criminal defense attorney appealed the conviction because the defendant was denied his Sixth Amendment right to a trial by jury. The criminal defense lawyer won the appeal because the law allows any defendant to have a jury trial if he/she is charged with a crime that allows for a sentence of more than six months in jail even if the judge promises that the defendant will serve less time, or no time, in jail if he/she loses. Therefore, the defendant was entitled to a new trial in front of a jury. However, it has to be mentioned that forcing the taxpayers to pay for one trial involving a small amount of the cannabis plant is a complete waste of time. If the state has to pay for two such trials in this case, some people should be forced to find a different line of work that does not involve taxpayer money.