I remember 5-6 years ago the seniors at the two high schools in my town decided to do a ‘senior prank’ in which they switched places for the day. The seniors from my high school were all able to walk in and wander the halls for two whole periods before they were caught. Some of the students from the other school were able to get in but most were turned away at the door. These schools are relatively small with classes around only 100 students. Yet, security was lack enough that 50-100 intruders were able to enter completely unnoticed and the schools did almost nothing to address this.