[1Old Pro]

The chemical autopsy tests prove he ate too many, 3x too many to remain alive.

[jdsteel]

4x too many.

[House Atreides]

“The chemical autopsy tests prove he ate too many, 3x too many to remain alive.”
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And that “3 times the fatal dose” level in his blood just includes the percent of his oral “intake” his digestive system managed to absorb by the time of his death. Death was coming for him... either at the time of his actual death or a few minutes later.