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I think other answers here are more essential - chain of custody, corroborating evidence, etc.
That said, Leica has released a camera that digitally signs its images, and other manufacturers are working on similar things. That will allow people to verify whether the image is original or has been edited. From what I understand Leica has some scheme where you can sign images when you update them too, so there's a whole chain of documentation. Here's a brief article
Cameras with stronger security will become more and more important, though on a theoretical level, they could be cracked or forged, but I suppose it's the usual cat and mouse game