Nonetheless , polls conducted from 1966 to 2004 found that up to 80 percent of Americans have suspected that there was a plot or cover - up .
However , Kennedy 's assassination is still the subject of widespread debate and has spawned numerous conspiracy theories and alternative scenarios .
Polls conducted from 1966 to 2004 found that up to 80 percent of Americans have suspected that there was a plot or cover - up .
However , Kennedy 's assassination is still the subject of widespread debate and has spawned numerous conspiracy theories and alternative scenarios .