Hello, I own a prison server, and I am planning to incorporate drugs. Free people make farms in survival, and I would like them to sell it to prisoners for a high price. However, If they are caught they will get demoted back to D rank. I am thinking of making a drug center where players can trade drugs with each other. My questions are, How will I get guards into this trade center, and two how will I make it so players can only trade drugs and nothing else? thanks, lsutiger25