Low blood METH concentration indicated he was under the influence of WITHDRAWAL - desperate for his next fix and mentally destabilized.
Agitated so much that the cops had to pull him OUT of the police car to try to ‘calm’ this drug addict down.
Destabilized biochemicals go a long ways to making someone fall dead so much more easily....
That assumes a whole lot of facts not in evidence starring with your interpretation of the meth level.
You see using evidence to fit your narrative. It’s a dangerous thing