There was a phenomena that happened during the Cooper era that extended into the Tressel era - that being that every summer, you could count on 2-3 starters and a half dozen other players getting arrested for minor to major offenses and/or suspended for academic reasons. The criminal problems usually involved females, bars/clubs, alcohol, or drugs. It was a law.
Meyer comes in, and despite his reputation, that shite ended. We are talking about very young men, so there were occasional poor and immature decisions, but not the every year, every summer types of problems. Day has continued this trend.
I would love to know exactly what they put in place to get this result. But knowing something about human nature, it involves very clear expectations, hard rules, and certain severe consequences if those rules are violated.
Anyway, this aspect of Day's program should not be ignored - but it is.