I had an "acquaintance" give me a tour of his grow right after I got my card. It was nice because I got to see what I would be dealing with, but I warned him right off the bat to not show anyone else. He said he knew that I had a card so I was cool. I informed him that while I might be cool, the next guy might not. Nothing to do with the card. I even threw out the possibility that a licensed grower is more likely to rat you than an underground grower because the guy with a card has the law on his side. He said he never thought about it that way and I just said it was probably due to my "Trust no one, especially yourself." attitude.