Mike Tyson biting into the ear of Evander Holyfield

FILE - This June 28, 1997, file photo shows Mike Tyson biting into the ear of Evander Holyfield in the third round of their WBA heavyweight match in Las Vegas. Violence is part of the game in many sports. But when the Cleveland’s Myles Garrett ripped the helmet off Mason Rudolph and hit the Pittsburgh Steelers’ quarterback in the head with it, the Browns’ defender crossed a line _ one that attracts the attention of authorities sometimes from within their sport and in other cases from criminal prosecutors.(AP Photo/Jack Smith, File)