While the number is an overall small one in relation to the whole of the student body, it's still a significant number of students from one university arrested.
Do not discuss the legality/illegality of drugs, or their use, or their dangers. Drugs are not the topic of discussion here. This could have been any criminal enterprise, from bookmaking to loansharking to auto theft. Drugs are not the topic here.
Rather, the topic for discussion here is how these college students, with a seeming air of impunity, were able to establish an organized criminal organization on campus. I mean, they used a "mass text message" to advertise. And they were armed, as well. They even used fraternities as their base of operations.
When did Criminal Enterprise become a course curriculum?
In any event, they were saying on the televised news reports that more arrests are expected.