Maybe this man's argument is what you are looking for and why CE399 is not considered legitimate evidence. Basically chain of command of evidence was not followed!
https://hybridrogue1.wordpress.com/2016/03/28/forensics-ballistics-jfk/"CHAINS OF CUSTODY"?In this article I address the chain of custody for the so-called ?magic bullet,? otherwise known as Commission Exhibit 399 (or CE399). According to the Warren Commission, this bullet wounded both President Kennedy and Governor John Connally.
In fact, the chain of custody for this central piece of evidence is non-existent. The true and amazing story about the near-pristine ?magic bullet? found at Parkland Hospital shortly after JFK?s assassination has been carefully pieced together by analysts such as Sylvia Meagher in the ?60s and John Hunt in the past few years.
Although Secret Service agent Richard Johnsen received the bullet in Parkland Hospital by about 1:30 p.m., an hour after the assassination, Johnsen?s initials are nowhere on the magic bullet, despite regulations mandating Secret Service agents to initial forensic evidence.
Johnsen handed the bullet to the Secret Service Chief James Rowley at Andrews Air Force Base at about 7:30 p.m., who didn?t initial it either. Neither Johnsen nor Rowley could identify the bullet when shown it later." ......
Interesting discussion ensued about the hulls and then back to the CE399:"Considering the time zones, it was between 90 minutes and 2 hours after the arrival of those fragments at the FBI labs, that Tomlinson was awakened by someone from the FBI, demanding that he ?keep his mouth shut? about the bullet he found at Parkland hospital. This is from the recorded 1967 interview of Tomlinson by Ray Marcus. The interview is also documented in the HSCA records.
Tomlinson: On Friday morning about 12:30 to 1 o?clock ? uh, excuse me, that?s Saturday morning ? after the assassination, the FBI woke me up on the phone and told me to to keep my mouth shut.
Marcus: About the circumstances of your finding the bullet?
Tomlinson: That is (one short word, unintelligible) what I found?
Marcus: I understand exactly what you mean, when they call you, it?s pretty authoritative. But the thing is this, did they say ? was there any particular thing about what they said or they just didn?t want you to talk about it period?
Tomlinson: Just don?t talk about it period.
[?]
In contrast to all of these very solid corroborations,
we have 100% denial by the four men who examined the bullet that Tomlinson found, that it was CE399. Unlike many other issues related to the case, this one is not a tough call. It seems that J. Edgar Hoover agreed, because in recordings of telephone conversations between him and LBJ, he suggested that Connally was wounded because he came between the President and an assassin, and that if Connally had not come between them, JFK would have taken his bullet."
....(added as argument continues and comes back)"Within an hour after the assassination, Johnsen was given the bullet by Parkland hospital security director O.P. Wright, after orderly Darrell Tomlinson found it by a stretcher. Like Johnsen and Rowley, neither Wright nor Tomlinson could identify the bullet.
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The first 4 links in the chain of custody of the bullet found a Parkland are unable to identify it as CE399.
They are:
1. Orderly Darrell Tomlinson >>
2. Parkland hospital security director O.P. Wright >>
3. SS Agent Richard Johnsen >>
4. Agent Rowley (Secret Service Chief).
A break in the chain of custody at this proximate point proves that the bullet of record, CE399 is NOT the bullet found at parkland, and therefor CE399 is a planted bullet by the highest authorities themselves."
Footnote: Consider that SS Agent Dick Johnsen was the one assigned by Clint Hill to accompany JFK's body on the airplane. It seemed this was necessary to make sure no body switching conspiracy could ever have deemed to have happened! (Tippit was a look alike some have conjectured). Then, we also learn that this same Dick Johnsen is the one who also carries the magic bullet CE399 during its path to the crime lab. It seems also that Clint Hill (Mrs. Kennedy's SS body guard) takes control of the whole crime scene. Was not Emory Roberts the man in charge?