Wrongful Convictions and Media Tunnel Vision

There does not seem to be much research on the relationship between the media and wrongful convictions. The main theme seems to be: 1/ that wrongful convictions happen when the police are pressured to find a suspect in the face of media panic; 2/ that the media sensationalize cases of wrongful conviction when they are discovered; and, 3/ that the media are instrumental in exposing cases of wrongful convictions.
While not doubting any of the foregoing it seems to me that a more intimate connection between the media and wrongful convictions might be theorized. For example in looking at media coverage of Donald Marshall in the Globe and Mail, the first mention comes in 1982 when his wrongful becomes evident and he is released on appeal. There are many different spokespeople, including him. Initially the main reason offered is eyewitness perjury, and not until later is a more nuanced explanation available.
However in 1971 the main source is the Cape Breton Post. The only authority is the police, and it is their version of events which is accepted and relayed to the public. At a point in the reporting of the trial it is mentioned how one witness recants in a courthouse corridor only to re-recant in court. At this tipping-point a very different story could have been written but was not.
This is media tunnel vision, where one direction is pursued to the exclusion of others.