I personally feel, based on some other things I've heard about this case, that the police were not being completely forthright about the Drug angle. Not sure that Sherrill was personally involved in anything of that nature, but potentially someone she was associating with. If you remember, one of the things police said at one point shortly after the crime occurred was that, "Sherrill had made some poor choices", but they never elaborated further about what they were referring to. And I think they were referring to either something she got herself involved in, or someone she unwittingly got herself involved with. I think the police have down played the drug angle on purpose in an effort to not overly tip their hand regarding what they REALLY think happened, so as not to compromise their investigation, or wrongly accuse Sherrill of something they couldn't completely be sure of, or prove.