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There is a case where a woman "stabbed her self" 17 or so times, including in the back of the head and it was ruled a "suicide"

It does not take much for a motivated medical examiner to rule a death a suicide, their are plenty of examples where clearly not suicide was been rule suicide in history.

Then there is always the movie "The Shooter" where they had an arm contraption purpose built to force someone to "commit suicide", The device itself is plausible