The "Warren Report" was published in September 1964, less than 1 year after Kennedy's death. For about a year or two after that, it was considered in bad taste to publicly cast doubt upon the Report's findings/conclusions. But by 1966 it was clear (or, as clear as anything can be as a result of polling/survey data) that most Americans did not believe they had been given the full story. That disbelief has continued to this day, and I daresay it will continue for as long as Kennedy's assassination is remembered.