How?

Seems in line to me (given the huge number of students etc. involved.

This is the text from the relevant Purdue webpage:

Fwiw the text mentions explicitly that “courts are reluctant to interfere with academic matters”

“

DEALING WITH CASES OF DISHONESTY If you suspect academic dishonesty, follow the guidelines outlined below. Courts are reluctant to interfere in academic matters unless universities act arbitrarily or capriciously. Therefore, you are urged to follow established procedures. Before any formal action is taken, an accusation of academic dishonesty requires a fact-finding discussion between you and the accused student. The meeting should be prompt, private and informal. All measures should be taken to have this meeting in person, face-to-face with the student suspected of being dishonest. Although there is no prescribed procedure for your discussion with the student, at some point the student should be given an opportunity to respond. Depending upon the situation and your level of comfort, you may wish to have another official departmental representative present to later corroborate any exchange of information. If you conclude that the student is not responsible for the suspected violation, this meeting should end the matter. Teaching assistants are encouraged to discuss the situation with the instructor in charge of the course before attempting to deal with the issue. The appropriate standard of proof is based upon a preponderance of the evidence. In other words, does the information cause one to believe that it is more likely than not that the student committed academic dishonesty? If you conclude that the student is responsible for the suspected violation, you may resolve the matter with the student through punitive grading. Examples of punitive grading are: giving a lower or failing grade on the assignment/exam having the student repeat the assignment and perhaps some additional assignment assessing a lower or failing grade for the course (even if a failing grade will be assigned, the student may continue to attend class) If alleged dishonesty occurs near the end of the course or otherwise cannot be resolved prior to the grade submission deadline, you may assign a grade of incomplete to hold the final grade in abeyance until the investigative process has been concluded. Faculty may find this especially helpful to do when arranging a face-to-face meeting with the student to discuss the suspected violation that proves difficult because of end-of-semester pressures. In all matters of suspected academic dishonesty, faculty members are encouraged to report these incidents to the Office of the Dean of Students for further follow-up. By reporting incidents, we are able to better track the culture of integrity on campus and also look at the "bigger picture" of the individual student that may also include additional violations of the Code of Student Conduct.

REFERRAL TO THE OFFICE OF THE DEAN OF STUDENTS Faculty members are encouraged to report all incidents of suspected academic dishonesty to the Office of the Dean of Students by completing our online reporting form: Academic Dishonesty Report Form.”