With Willie Brown, a member of the Pro Football Hall of Fame, he is considered to be the originator or one of the earliest proficient exponents of Bump and run coverage, by which a defensive back impedes progress of the wide receiver by body contact, a style that was followed by later Oakland cornerbacks, such as Lester Hayes.
This rule stipulated that a player could only make contact one time beyond 3 yards of the line of scrimmage.
Starting that season, a defender could only make contact with a receiver one time overall, whether it be within 3 yards of the line of scrimmage or further downfield.
Starting that season, a defender could make contact with a receiver only one time, and within 5 yards of the line of scrimmage.
If the defender made contact with a receiver 6 yards or more from the line of scrimmage, it was now considered pass interference, even if the ball was not yet in the air.