Maybe. The prior juvenile record shouldn't be a factor, but I've seen some prosecutors try to argue the juvenile record at adult sentencing. The better question though, is what will happen to your two other friends with completely clean records. Theft is one of those charges where what happens to the person in court isn't as bad as what will happen out-of-court. A theft conviction will have major implications on getting a job, applying to college, or in professional licensure. A lawyer can try to negotiate a dismissal, or a plea to a non-theft offense.
They could be facing up to 6 months in jail, although that is highly unlikely as first time offenders. They should seek legal counsel to try and prevent theft convictions on their records. As the other attorney stated, a theft conviction has many out of court consequences for the future. Good luck to your friends.
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