crime cover up experts smeared

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Why are certain people discredited, their names smeared and reputations trashed when they do not adhere to the narrative?
Goncalo Amaral, Peter Faulding, Richard Eikenbloom and Steve Thomas were all important, professional and competent in their various roles, but were all destroyed in the process of conducting investigations. Join AD as he deep dives into the reasons of these experts demise.