Why didn't Sherriff Decker testiy about being in the lead car?

[Betty Chruscielski]

By enlarging the attached picture to 400% and focusing on the back window of the lead car you can see that Sherriff Decker is facing the rear. With this vantage point, why didn't Sherriff Decker testiy to what he saw while riding in the lead car. Police Chief Jesse Curry testified that he saw commotion in his rear view mirror but didn't know what was going on til a motorcyclist rode up and told him. The motorcyclist riding up has never been verified in any other photo. Sherriff Decker should have been telling him minute by minute what was happening. Win Lawson gave in very specific detail about his ride in the lead car. Forrest Sorrells testified to his ride in the lead car. Sherriff Decker did not.
Why did Sherriff Decker tell his men that no matter what happened that day 11/22/63 not to interfere?

[Drew Phipps]

It has come to my attention that the former (possibly mob/teamsters-built) "Cabana Hotel," a couple blocks from Dealy Plaza on the Stemmons freeway, connected with so many players in the JFK mystery is now the "Decker Jail".