+1 for Karl Rehn and KR Training. This is where I take my family for training and where I took the School Safety Certification. https://www.krtraining.com/
Unfortunately, Karl does not show any School Safety classes on his schedule right now. That could change. Subscribe to his newsletter to get updates. https://gem.godaddy.com/signups/170693/joinj
Karl offers a 1/2 day, 1 day, the full 2 day versions of the course. DPS certification requires the 2 day version.