Affidavits are written by people and signed as their own statements. Allen never said "Gray was trying to hurt himself and I heard it!" or anything to that effect. The document in question was written by a police officer who was investigating Gray's injuries while in police custody. So, that makes it a thirdhand source, which has been refuted by Allen at the first chance he was given.
I also have a report here on my desk that says Excon admits to lying literally all the time.
Care to comment? I'm sure we can't take your firsthand account seriously, seeing as how we've already established that you like to lie. But I'll allow it for journalistic integrity. So, what say you? Did you in fact admit that you lie literally all the time?