Bill Cosby's lawyers accuse prosecutors of playing 'gotcha' game

Lawyers for Bill Cosby have accused prosecutors of playing a game of "gotcha" by waiting 12 years to charge the veteran entertainer over a sex assault case and using his evidence in a civil lawsuit against him.

Defence lawyers filing their final motion before a key pre-trial hearing next week say Cosby, 78, had a promise from authorities that his evidence in his accuser's civil action would not be used against him.