When do TV commercials need to use disclaimers?

HowStuffWorks "When do TV commercials need to use disclaimers?": "In the summer of 1941, television was in its infancy. The Brooklyn Dodgers were about to take to the airwaves. It wasn't the first baseball game ever televised, but the day marked another first. Before the program, audiences saw a picture of a map of the United States along with a ticking clock and the words -- 'America Runs on Bulova Time.' On July 1, 1941, the TV commercial was born."