also criminal defense attorney mark geragos. there's so many unanswered questions here. lack of a murder weapon has made this investigation so difficult. do you believe this is real? and the significance of it. >> well, i have a lot of skepticism. the length of time, the peculiar circumstances of, you know, something disappearing and being found and handed over to a cop. i think the odds are that this is the murder weapon are very low, but i think it's very appropriate that they investigate it, though it is clear to me that it could only be of historical interest. there is no chance of a state prosecution under double jeopardy, and there is no chance, in my opinion, of a federal civil rights case. just the facts don't justify it. but, look, like all people, like most people, i'm interested. but i think it's really just historical at this point. >> mark, the chain of custody of this knife, allegedly went from a construction worker to a police officer, kept it for years. who knows who else could have handled it. it's got to make it incredibly difficult to extract anything