Do you not have to have completed law school to become a judge?

[HoreTore]

Harry S Truman first elected office was judge. That was the jobs title. The county elected 3 judges and between the three they chose a Presiding Judge. Harry was chosen. No formal education beyond high school.

My memory of Truman may be a bit shaky, but wasn't he elected into the bureaucracy of a court? Ie. he was overseeing stuff, but not actually passing judgements and all that?