Regarding Jodi's claim to have pictures of herself and her sister out in the desert someplace far away on the day her grandfather's gun was stolen:
The timestamps on the photos (if they even exist) would not be sufficient evidence of when they had been taken, because the clock on the camera could have been altered to any date and time Jodi wanted. It would not, of course, surprise me if Jodi had in fact tricked her sister into a photo session without telling her at the time it was a bungled attempt at a staged alibi.
At some point (if the pictures exist) Jodi either realized or had it pointed out to her that her sister would have to be in court under oath when the "evidence" was entered to offer proof that the timestamp on the camera showed the correct day. I'm assuming this would require her to commit perjury and was the end of the fake alibi.
Jodi is counting on lots of people not being able to figure this out. (moo)