What's the Credibility of a Witness?

Police officers' training has to be kept to a certain level of rigour in order for it to er hold up in a court room. A big part of that is training as far as what the credibility of a witness might be. So no matter how trained you are, your body does certain things with a drinelin. And you can train your body to respond right to those natural things that it does. But he just was doing that, then he saw something alarming, like ie, as he's in the act of that hidrinelin activity, then he goes and sees something that is out of his experience and kind of weird and freaky. That'd probably be peka dun