IMO, if its a small town and word is out about it anyway - obviously it is, if you weren't fishing for the information and got it anyway - then I don't see how your family member is going to find out you were the one to tip off the police.

Write an anonymous letter stating what you heard and mail it to a detective in the police department. That way, there will be no phone call, and no one will know it was you. You will be sure that way it won't slip later that you were the one to tell.

If they choose to act, they can set up an undercover sting operation. I used to date a sheriff who did undercover narc work. It was simply amazing the things they could pull off, very convincingly. Of course, if your small town is anything like my small town, they may or may not act, depending on many political issues. But that's not your problem, all you can do is report it anonymously and wait and see. Give it some time.

I too, used to buy the "only pot" argument completely. And I still do believe pot is far cry better and safer than harder drugs. However, since my son failed his ninth grade year of high school, was arrested, spent a night in jail with a child molestor and a murderer, was sent to the state reform school for three months, is on supervised probation for a year, and cost us thousands of dollars .... for "ONLY pot" ... I have developed a bit of a harsher view of the drug. Yes, it better than crack or meth. Yes, it relatively physically and psychologically harmless compared to other drugs. Yes, it's organic (unless laced, of course). However ... it is illegal. It is addictive. It is highly unmotivating and has most certainly ruined countless lives and families. Only pot? Sure ... until you watch your only child who just barely turned fourteen years old drug away in shackles and handcuffs, thrown in a van, and driven 300 miles away to a military reform school where he spent 85 days cold, hungry, sick and miserable. For less pot than one could roll one joint with. Only pot?