Attacker Bolting News Today

Nearly a year. >> hands up dont shoot. >> reporter: police chiefs around the country are discussing how they believe policing in america is in crisis and street tactics have to change. >> any police department would be foolish not to look at those situations that theyre seeing all over the country and saying how could this have been avoided? >> reporter: one tactic the 21- 21-foot rule, the belief an armed attacker bolting toward an officer can cover 21 feet in the time it takes a policeman to d...