jared holbrook showed us sop of the surprising thing people tried to get past security. >> reporter: what are we looking at here? >> we're looking at a collection of items we discovered in our search. >> reporter: all of this is from the past year. >> we're averaging about 20 knives per game. >> reporter: mary millen has been working at amilee arena for 16 years. she says reinterrorist attacks have more peep bringing guns, which are not allowed, even for off had duty law enforcement. >> reporter: since paris, you've been seeing an increase? >> absolutely. >> reporter: when the circus was at amilee, more than a dozen guns were spotted. an additional 12 guns were lightning games since september. >> since paris, people krrnd for their safety. you're seeing more and more of the population looking for ways to protect themselves personally. >> reporter: since september, security confiscated more than 500 knives. >> we're seeing a plethora of knives. knives in every shape, capacity. >> reporter: including clandestine knives like this, you. >> it fits in your wallet like a credit card. >> re