It's possible that everybody here except you is a cop (maybe you're a cop and you don't even know it).. we're all just posting pics from busted grow houses lol... Police officers are notorious liars
No but seriously, don't post any names, locations, pics of your face, outdoor pics of landmarks, crops larger than a standard closet, and don't agree to meet anyone anywhere, or sell anyone anything. Don't brag about hook-ups, selling weed, or doing/selling harder drugs.
I'd say a good percentage of us are recreational or medical users and LEO's, for the most part, aren't interested in wasting time with people who can't produce a bigger fish to fry. Not to mention that some of us live in other countries, the internet isn't exclusive to the U.S. after all.
If the cops did want to know everything about your account here they could do so without informing anyone but the hosting company. They would simply get a warrant for a copy of this site's database and then they would have every RIU users' nick name, email address, ip address, and password. I highly suggest that no one use the same password for RIU as they do for all their other accounts.