(CNN) -- Before dropping off his son at Colgate University a few days ago to begin his freshman year, New York advertising photographer Robert Tardio went on one last summer vacation with his family. While his wife and youngest son were out exploring the quaint streets of Montreal, Robert took his eldest, college-bound teen out for a beer. "My son is an incredible, conscientious young man. But at 14, 15, 16 -- alcohol was out of the question. We made it very clear what our expectations were and that he would not be drinking."