JMO, but I would not think this likely, either for the drugs or the disposal of the body. JLM is a native of the Charlottesville area and we know he has lived and has family in various rural areas within a half hour or so of C'ville. Given how thick the undergrowth of vegetation is in Virginia forests and fields, it seems far more likely to me that IF HG is no longer alive and JLM is responsible, he would have found it fairly easy to dump a body where it wouldn't be likely to be found so quickly or easily.
Also, in regard to Longo's comment about HG's world being turned around/upside down, I think that statement is vague and open to many different interpretations, unless it was clarified by Longo after the Friday press conference. Having looked repeatedly at the videos of Hannah on Grady and Preston Avenues, I still find it extremely difficult to believe she was lost. If you weren't sure where you were going after leaving that pub, it seems so unlikely you would continue down Preston Ave, where hardly any people or businesses are, and keep moving deliberately towards the downtown mall. I feel certain that LE must have an idea of what her intentions were by now, but the general public is not privy to that information now.
Did HG know JLM already? We don't know. Somebody suggested perhaps she had a crush on him, but really? I'd find it hard to believe undergrad would have a crush on a C'ville townie in his 30s who likes to hang out by himself at downtown bars and has a low-paying blue collar job. I realize how snobbish that sounds, but I really can't see how they would ever be moving in the same social circles at all. Yes it's a generalization, but town and gown rarely mingled when I was at UVa. Perhaps she was determined to find somebody, but I have a hard time believing it would be JLM, at least not for romantic interests. I don't even want to speculate what other reasons she could possibly have for meeting up with him, specifically.