That's possible. Without concrete data to give you, there are some suspicions that because of the much better performance of Asian students, they're being limited in the admissions process. Otherwise, Asian students would make up the vast majority of the students admitted. This would crowd out the non-Asian students accepted for admission. In this case, it would be more accurate to say that admissions officers limit the number of Asian students accepted instead of saying admissions folks are biased against Asian students.