Which is exactly why I think that the "cult" and "religious beliefs" are just smoke and mirrors. This was about killing people for cash. Pure psychopathy. Sure, maybe they made up some crazy mumbo jumbo justifications...but the common denominator is cash.
I so want CD to be charged with TD's murder. But, I think that evidence is slim to none after the embalming process. I think CD knew what would happen to the body during embalming, and used something that would be untraceable.
I have been reading about post mortem, after embalming, forensic pharmacological toxicology. It seems like it is practically impossible, unless the there is a specific drug that they are testing for, like heroin, to detect overdose. Without having any background information to start with, from the technical research I have been reviewing, it looks pretty impossible. The goal would be to identify how the drug was introduced to the body, for high concentration levels at a specific area.
CD's "goal" was to ensure no autopsy. Quick embalming and burial.