Cameras are objects that raise suspicion if you're doing any criminal acts, such as Mining, Digging, Destroying, Knocking Someone Out and Searching another Inmates Desk. They can detect if you have any contraband items on you.
You can use Duct Tape, Shaving cream, and Toothpaste to cover it temporarily.
Mobile versions do not allow you to use toothpaste to cover it, and Mobile does not have shaving cream as a item
When a camera detects something suspicions, it will flash red and call the nearest Guard to check it.