OJ Simpson: The case which divides opinion

Police in Los Angeles are testing a knife recovered on a property once owned by the former football star, OJ Simpson.
Someone claiming to be a construction worker gave an off-duty police officer the knife some years ago and he kept it, thinking the case was closed.
Simpson was acquitted of the murders of his ex-wife and her friend in June 1994 - in a case which has always divided people, as the BBC's James Cook reports.