I think what stood out to me when Prior was cross examining Ben Dean, was that Prior did not understand (or did not listen) to what Bens role actually is. Ben is an analyst, looking for patterns, and just reported on the patterns he did find. I think Prior is out of his depth when it comes to electronic communications. The most obvious question to ask was, could the prosecution prove when the text from Chad was sent? As the examination (and therefore testimony) was in relation to Tammys phone, would that not only show when it was received by Tammy and not necessarily when it was sent by Chads phone?