Anyone simply looking for evidence that salmon farms could be infecting wild salmon will find enough five minutes into Twyla Roscovich’s documentary “Salmon Confidential Documentary.” The evidence is laid so convincingly that one is tempted to turn the video off. That would be a mistake. Salmon Confidential Documentary follows biologist Alexandra Morton, as she seeks the cause of the massive salmon die-offs before they can spawn. As she gets closer to the answer, the question becomes why is the Department of Fisheries and Oceans not doing something about it?