Melbourne Australia - AFL football match between Collingwood and Carlton.
82,000 people in attendance.
Police were called to a fracas between spectators. On searching the two antagonists, two loaded guns were found on their person.
AI screening had detected the guns when the two passed through the screening gates.
An alert was sent to security guards who did not follow up.
What might have happened if the fracas had not occurred?
No use having all the security protocols in place if the guards fail to do their jobs.