What is the purpose of the small window in prison doors?

2,072 Prison Door Stock Video Footage prison door food slot door be opened or that the patient be taken to a different area whenever this is deemed necessary to resolve doubt about the Food Slot Undue Noise prison door food slot Deputy Stephen Vasquez points out changes to the food tray slots to prevent inmates from throwing waste during a tour of “gassers' alley” at the

wild weather slot Primary purpose is to allow food trays be handed through the slot (It is called the ''food-tray-slot'' in better language and ''bean-slot'' in