Interesting about the drug aspect. If drugs do play a role in this, it might not be that it was someone looking for drugs at all, thus no ransack. It very well could be a money owed situation, either as a user or supplier, and when monies weren't coughed up, someone was looking for something -- maybe cash/valuables and it wasn't known someone would be there, or murder actually was the intent as punishment or a message. It could have been the intent to harm Janet as a message to Raven, or it could have been the intent to harm Raven himself, or both if no witnesses wanted, as punishment but he wasn't there. If there was someone he owed money to, whether it be drugs or something else, LE may have a good idea of who and it would explain why it wasn't "random" and also why they are being tight-lipped about it.