One game, yet many potential different security threats. From the football field in Santa Clara to the Super Bowl City in San Francisco, security is a regional-wide worry.
"I think the challenge is the visibility," said former Denver FBI director Jim Davis.
Davis worked security during Super Bowl 40 in Detroit. He said Super Bowl 50 security compares to when the Democratic National Convention was hosted in Denver in 2008.
"It is about as big an event as law enforcement will have to prepare for," said Davis.
From the attacks at a hotel in Mumbai, India, to massacres in Paris, France and San Bernardino, Calif., these game-changing attacks -- using small weapons, multiple shooters and often multiple locations -- are altering the way security is handled.
"That is the terrorism event that gives law enforcement the greatest concern. I mean, that's what we're most worried about," he said.
Because of that risk, daily routines are changing in California. It's not just the presence of police and metal detectors. Everyday office buildings are under scrutiny, too.
"Homeland security has taken over security on our building. Our bags will be checked on the way into work and we are being told things not to have," said one employee at a California business.