Actually, had it been any other Joe Blow, he would have walked due to procedural errors.
I do not think so. My wife has spent her career as a medical lab tech, often the lead or the supervisor, being responsible for all the certifications. She has processed the blood tests many times for intoxication over the years. There is a very stringent legally written proceedure to make sure the test is legal for court. Lots of extra work. Right after bisard crashed, I remember the supervisor of the lab on TV being interviewed. She said that every single step of the legal protocol had been followed to the entire letter of the law. Cut and dry, it is science, not opinion.
Within a couple weeks started this whole discrediting of the blood tests. Repeat a lie often enough and it becomes the truth. Three years latter, the truth of the test is now "fuzzy". If there is a problem with evidence, it is because someone is a liar, not because of proceedure. It would not be hard for me to understand that his buddies were trying to save his hide. I reject any rumor that he was rail roaded.