My Theory on why TD's results haven't been completed/released:
If I was the lead on the death investigations (JV, TR, JR, AC, and TD), I would want autopsies and toxicology on all of the deceased before making the findings on any individual one released. I personally believe that JV's remains are the best chance of finding any type of poison. At this point in time, I would want to test JV for Risperdal and malachite specifically (just personal speculations for these two possible toxins). If either of those are found in him, now I would want to test the other deceased persons for that same thing. There is limited tissue available for testing in regards to TR and TD and possibly none for JR and AC, and TD's tissues that are available have been compromised by embalming. Searching for non-standard toxicology takes time. We all need to have a lot of patience on this. There is no statute of limitations on murder.
However, regardless of what specific toxins LE may be searching for, I believe that this process would be the most prudent.
As always, MOO!