<p>I think that it is important NOT to make assumptions. Your son may or may not be a coke addict. Although it is indeed very addictive, plenty of people use it occasionally and are not addicts. And, as JHS said, MANY people experiment with drugs and alcohol in college and emerge without problems. That is not to say that there is no cause for concern.</p>
<p>You say that there was a bag of white powder. How much was in that bag? A teaspoon, a tablespoon, a quarter of a cup, a cup? A gram of coke is a very small amount. If your son had a bag with half a cup of powder in it, either it wasn’t coke, or he is dealing.</p>
<p>Something that occurs to me would explain why he comes home regularly and why the drugs were in his backpack: his supplier may be local to YOU. He may be dealing at college, or he may be making supply runs for his buddies. If either is the case, he needs to stop NOW. He needs to understand that he is playing with fire. </p>
<p>Of course, this is pure speculation. I like the idea of finding a drug counselor near his school and having your son and both of you sit down with him or her. Such a person has heard it all, and is adept at ferreting out BS. When you know what, exactly, your son has been doing, then you can formulate a plan to deal with it. Until then, your efforts may be misguided and counter-productive.</p>