I have a friend that is secretly using drugs(cocaine) I have suspected that she was doing it because of the people she hangs around with. Yesterday I stop over by her house on the way home from work, she already had company when I walked in the door one of her friends was doing lines, and quickly put it away, I didn't say anything. I just walked to the bathroom and debated if I wanted to stay there or leave or even if I should say something to her about. After being in the bathroom for 5 minutes , when I walked out she was doing it, and also tried to cover it up. I have known her for about 30 years, she is actually a big sister to one of my childhood friends, my question is jow or should I let her know what I saw, and let her know that I am not judging here for what she does. I still love her as I person , just not sure what to do. I do value her friends. What should I do?