It should not be stunning, since alcohol violations are relatively common at fraternities. Of course, writing a statement conflating (non-alcohol) drug and alcohol violations can cause some readers to believe that (non-alcohol) drug violations are more common than they are.
Non-alcohol drug violations are comparatively rare compared to alcohol violations, according to the University of South Carolina fraternity disciplinary information at https://www.sa.sc.edu/leadershipandservice/organizational-student-conduct/ .