He was only found out because he was so bloody flagrant. If he had only made up 10 or 20% of carefully selected stories, to slant the truth, he would have gotten away with it for years.
Like most liberal liars in the lamestream media.
Peter Jennings has gotten away with it for years. Former ABC reporter Peter Collins has recently spoken out about Jennings' rewriting his reports to favor the Sandinistas with barely a ripple in the mainstream press.