Cheating amongst foreign students, particularly those from India and China, occurs at elevated frequencies [1]. But there is money to be made. Universities earn fat tuitions. And parades of scumbags take exams, write papers and falsify figures for a fee. The result is limited enforcement in the specific, i.e. against offenders and facilitators, in favor of a presumption of guilt in the general, i.e. against all foreign students from China and India.
I personally know honest individuals who had to overcome a presumption of cheating at school, at interviews and in the workplace. And it isn't just the cheaters who are complicit.
[1] https://www.wsj.com/articles/foreign-students-seen-cheating-...