The fact that JFK's tie proves that no bullet exited the throat and shirt slits also explains the fact that the throat wound was too small to have been an exit wound for a 6.5 mm bullet. Dr. Finck wrote that the throat wound was approximately 5 mm in diameter. Dr. Perry, who obviously saw the throat wound before he did the tracheotomy over it, told Dr. Humes that the throat wound was "only a few mm in size, 3-5 mm.” The alleged lone gunman supposedly used 6.5 mm bullets. A missile of this diameter would have made a much larger wound if it had exited the throat, as the WC's own wound ballistics proved.
In the WC's own wound ballistics test, the smallest exit wound that was created in the simulated human necks was 10 mm in diameter. The exit wounds in the WC's test were also punched-out, whereas JFK's throat wound was punched-in.
Reaching and straining, WC supporters attempt to explain the WC test results and the throat wound's contrastingly small size and punched-in feature by speculating that JFK's collar band restrained the skin of the neck as the bullet transited the neck, thereby enabling the bullet to cause a small punched-in wound. This makes no sense. How would the skin, even if tightly restrained by the collar band, not have been punched outward by an exiting bullet? The edges of the wound might not have been as pronounced, but they would still have been pushed outward. They certainly wouldn't have been punched inward.
Moreover, the restrained-skin argument ignores the fact that the shirt slits, supposedly made by an exiting bullet, were below the inside collar band, so the skin behind the slits would not have been restrained.
Furthermore, it seems very doubtful that even the skin directly behind the collar band would have had time to become significantly restrained. Why? Because the bullet would have transited the neck in no more than 55 milliseconds. To get some idea of just how fast this would have been, consider that an eyeblink takes 100 to 150 milliseconds. What little degree of restraint that the bullet's alleged transit through the neck would have caused in such a microscopic amount of time would have been negligible.
All of this, in turn, helps us appreciate the explanatory power and importance of Dr. Carrico's key information that the throat wound was above the tie knot. Sadly, SBT believers pretend that Carrico's testimony was "unclear," "ambiguous," etc. No, it was not. WC member Allen Dulles specifically asked Carrico to "show" him where the wound was, then asked him to confirm that he was putting his hand just above his tie, and then Carrico said yes. So Carrico was demonstrating where the wound was with his hand; he put his hand just above his tie, and then he confirmed this placement when Dulles asked him to confirm it. Carrico's testimony is only "unclear" and "ambiguous" to those who are so emotionally/ideologically attached to the lone-gunman theory that they refuse to accept evidence that destroys it.
In addition, as has been mentioned several times, when Carrico was interviewed by Harold Weisberg and was asked specifically about his exchange with Dulles, he confirmed that he demonstrated the location of the wound by putting his hand right above his tie knot. See Weisberg's book Never Again, pp. 241-242.
Finally, the throat wound's location just above the tie knot was corroborated by Dr. Ronald Jones, who independently and in two separate interviews, said the wound was above the tie knot.