Yeah, my policy on my CityRPG is as long as access isn't user-restricted, it's fine. I recommend you use the same tactic, RGGBNNNNN, cause you can follow the criminal. Chase them down and watch whatever they do, then repeat their actions. Watch them input the code, or watch what brick they click to reveal a secret passage. Otherwise drugs just become not worth it to the criminal as it's just too risky and pricy.