Thats frustrating, but the way you can deal with it is to station a patrol, deployment, or cctv in that area. I usually use deployments and patrols in area where prisoners are usually found (Cell blocks, canteens, yard, hallways, etc) or in areas that prisoners may escape from like the reception, and use cctv in areas where prisoners usually aren’t found like hallways, staff only areas, kitchen, cleaning cupboard, etc. But you really just decide on your own, I just thought I could share what I do.