Molly Beck, via several kind readers:

Cheating on math exams at Middleton High School began years ago and focused on students sharing photographs of test questions with their peers, two letters sent to the school allege.
The letters, one purportedly from a parent and one said to be from a student, both unsigned, name no students or teachers’ classes but describe a system in which many students participated in cheating, which included the selling of test questions, first-period students sharing test questions and students calling in sick on test days and later obtaining test information.
The letters, obtained by the State Journal under the state’s Open Records Law, were sent to the school this month. Officials this month made about 250 students retake a calculus exam because of suspected cheating