Autopsy proves SBT impossible ??
Not even close.
If one accepts that JFK's back wound was an entry wound and that no bullet was found in the body, it stands to reason that the bullet transversed his body and could have gone on to strike JBC.
So, no, the autopsy doesn't prove the SBT impossible.
I guess it's possible that somehow the bullet that entered JFK's back fell out and was never recovered, but that leaves the CTs another conundrum.
If the bullet that struck JFK in the back did not pass through his body and the throat wound is indeed an entrance wound, then where did the bullet that caused the throat wound go ?
I'm sure one of the geniuses here that claim the SBT is an impossibility has a logical answer.