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Karen Robbins, 49, was arrested over the weekend and charged with three counts each of criminal sexual conduct with a minor and committing a lewd act on a child.
The sex occurred with a 15-year-old in her car and twice at her home between September and November 2005, according to arrest warrants.
Robbins was a private school teacher at the time, and officials said the accusations did not involve one of her students.
Robbins was released from jail on a $90,000 bail.
Messages left at a telephone listing for a Karen Robbins in Clinton and with the county public defender's office were not immediately returned.