Whether its just 1 weapon that can be detected, or several, a lot of high schools have been using metal detectors for years.
Unlike a high school, a high-rise hotel has quite a high ground shooting advantage. Right up until October 2017, somehow a man could transport several bags of guns and ammunition into a hotel with the intent of conducting a mass shooting.
How the Las Vegas Gunman Planned a Massacre, in 7 Days of Video | NYT - Visual Investigations https://www.youtube.com/watch?v=6ZRgVX8SYX4
Las Vegas: Mass casualties in Mandalay Bay shooting - BBC News https://www.youtube.com/watch?v=pRnbzkMsgmM
https://thedigitallabyrinth.blogspot.com/search?q=The+Mandalay+Bay+shooter
