Police say a teacher at Quintanilla Middle School in Oak Cliff paid as much as $28,000 in bribes to a student with whom she is accused of having sex.

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Thao “Sandy” Doan, 27, is accused of having sex with a student of the school on multiple occasions. She allegedly paid the bribes after the boy threatened to expose their relationship.

The boy’s mother complained to the school’s administration that the teacher was giving her son large amounts of money and that it was causing problems at home.

Doan allegedly told police she began having sex with the student in the summer of 2015 after having contact on the messenger app Kik. She began receiving messages from an unknown person in January 2016 demanding money. But, she told police, she still had sex with the student again in December 2016.

She was arrested and charged with sexual assault of a child last week and bonded out of jail.