As the lawyers say.
What are the pharmacokinetics of the markers used to measure fentanyl in the body?
Do they change after death, or are there any decomposition by-products which interfere with the assay post mortem?
What is the sensitivity analysis of the methods used to detect fentanyl or its metabolic by-products (by analogy, merely having Covid-19 RNA in your system does not by itself prove you've ever been contagious)?
What is not just the LD-50 for fentanyl, but the distribution of LD-50 in the population as a function of body weight?
All these have a bearing on the chances that the fentanyl "caused" his death.
My god this is like shooting fish in a barrel.
That is what a trial is for.
I know that you are unaware of how this works but believe it or not the defense team will bring in medical experts who will present their side of it.
Have you ever heard about what happened to General Flynn? The prosecutors hid a lot of evidence. A lot of people, non thinkers similar to yourself, believed what they were told and declared Flynn guilty.
You have made up your mind. It is probably a lot easier to go through life having people tell you what to think so you don’t have to do it for yourself.
Some of us wait until all facts are presented.