Juan indicated in opening arguments that Jodi had the camera strapped around her neck when she attacked Travis.
( See https://www.youtube.com/watch?v=YLBPm8_EJbM – at 36 minutes 30 seconds, Juan indicates the camera is taken off and falls to the ground. He puts his hands behind his head, and says it is taken off the shoulder )
However the camera strap for Travis’ camera was found unused in it’s packaging.
So, you would need to suppose Jodi had a secret camera strap which she brought with her as part of a fantastic murder plan ( or perhaps she used her own camera strap : but the State did not lead evidence to show this is possible – and why use her own camera strap but not her own camera, except for the reason Jodi testified – because she was packed up ready to leave ).
And then she took the strap with her, but left the camera in the washing machine ( with highly incriminating photographs ).
This just makes no sense, UNLESS as Jodi testified, her memory had totally failed, meaning she had no idea what had just happened, or that the camera had incriminating photos. And it’s highly implausible Jodi would have removed a camera strap in any case.
Bottom line: in all probability, there was no camera strap. The prosecution theory is false.