How will being convicted of a misdemeanor - specifically shoplifting - as a teenager affect that persons chances of becoming a Supreme Court Justice?

Juvenile convictions are not part of the public record. After you turn 18, you can petition to have your record expunged, which would protect you from having to reveal any convictions on employment or enrollment applications.

Unfortunately, the record doesn't just "go away." Officers of the Court and certain other members of government can still access the information, if they have a legitimate need.

On the plus side, a single misdemeanor conviction in your juvenile record shouldn't harm your chances of attending law school, being admitted to the bar, or even becoming a member of the Supreme Court one day.

Most people will be more interested in the positive changes you've made in your life after that one unfortunate mistake. Conduct yourself as though you will held accountable for every decision you make, because we are judged by our actions.