You're post got me thinking. It's been said here on WS that certain toxins or poisons are difficult to detect after embalmment or time, especially if you don't know what you're looking for. If they can find a cause of death from the remains of JJ who's body was found intact and not embalmed or burned, perhaps they can then use that information to focus on specific trace elements in the deaths of the others. With that, if the method of murder was the m.o. of the murderers, wouldn't it be something if they can also find or perhaps even by now, already found these substances in someone's house, apartment, barn, or car?