I think the pictures are authentic, but the DA will look for any way to undermine their legitimacy. I doubt anyone has really tested that, but I suspect this is why the cameras, computers, and Ipods are being scrutinized. I have never in my life seen such an effort to convict someone when they have an alibi and no matching DNA or any other evidence, just the word of two known felons with a motive of greed.
I note with hilarity that Kim Roberts attended Carolina. :-)