The jacket and paper bag are non-fungible items. They were readily identifiable or had been made readily identifiable. Those items, along with the blanket were of little importance to the case against Oswald. The jacket itself would not have had much value to a prosecutor in a court of law because Marina would not be allowed to testify against Lee. No one else would have positively identified it as belonging to Oswald. Sam Guinyard's positive identification would be heard by a jury but it wouldn't have the value that Marina's identification of it would. The seven markings on the jacket were not needed but most of those who handled it marked on it anyway. The jacket is seen to be white under certain lighting conditions. Of course, you know that already.
Who said anything about how a jury would weigh the evidence.
You asked for examples of items of evidence that were mishandled by the DPD. And the list of items is massive!
The seven markings on the jacket were not needed but most of those who handled it marked on it anyway.That's actually not true. The two unidentified officers who actually handled the jacket did not mark it. Only Captain Westbrook did.
The other six people who marked it never handled it.
The jacket is seen to be white under certain lighting conditions. Of course, you know that already.Sure, but the radio traffic came from the officers who actually saw it at the parking lot. Were they so color blind that they couldn't determine the actual color of the jacket?