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THC lingers in the system for days in the occasional user and for weeks in the habitual user. Trace amounts in the system do not mean that the person was stoned. It means that at sometime in the past days or weeks he smoked.
“If Zimmerman was losing a fight he started, as you and Zimmerman agree he eventually was”
Was losing, I mean, not that he started it. Sorry if that was worded incorrectly.
In addition, the autopsy found the bullt hole. along with powder burns as well as trauma to Martin's knuckles. No facial injury to indicate Zimmerman hit him first as per your claim.
Even if it were the case that Zimmerman started the fight, once Martin had him on the ground and Zimmerman was calling for help, Martin would have the obligation to cease the pummelling. If he didn't Zimmerman, would be perfectly within his right to shoot him since he could not retreat with Martin on top of him.