Bowman had already been on probation after pleading guilty in May 2008 to disorderly conduct in connection with a campus fight the previous fall.
A probation officer said Bowman admitted to the marijuana usage during a meeting earlier this month, violating terms of his probation, which was initially supposed to end next month.
A judge gave Bowman a stern warning in court Wednesday, warning him that any more violations could lead to jail time.
Bowman had a team-high 106 tackles for Penn State last season. A team spokesman said coaches were in meetings Wednesday morning and could not be immediately reached for comment.
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