Intoxication is not the same as an overdose. Had the man been overdosed he would have been unconscious and the police would have had to call an ambulance instead of killing him.
My parents were meth addicts and I do know what an overdose looks like.
I think we witnessed him going unconscious.
You are spot on here. Similarly, the medical examiner statement "recent meth use" does not mean meth intoxication. Residual metabolites of meth may be identified up to three days after use.
The progression of severity with intoxicants:
1. Use/Abuse/Dependence (recent history, chronic use may be ongoing or in remission)
2. Intoxication (under current effect(s) with diminished capacity)
3. Overdose (excessive or dangerous dose=emergency)
I am very sorry to learn that your parents had meth addictions. I can't imagine the pain you experienced.