From the article:

"It's halfway through the school year and your college student has established a social routine. They are settled into their residence halls and have made friends in extracurricular clubs; they may also have participated in fall rush (Greek life) festivities and so are now part of a fraternity or sorority chapter. At this point in young adulthood, many students are also experimenting (as part of their social life, or on their own) with drugs and alcohol - perhaps for the first time. Unbeknownst to parents, some may be on the path to serious trouble with their substance use."

This article provides tips for keeping the conversation about drugs and alcohol going with your college student, even from afar.