You simply don't know how modern correctional facilities work. Do you think they are like the sheriff's office jail cell out of some spaghetti western?

Real cells are buried deep in the earth through miles and miles of corridors and behind airtight, soundproof, hermitically-sealed, thick metal doors. The guards can't hear what's happening down there. All the jailhouse confessions are heard through the walls between the cells and not the soundproof doors.

The radiation from the isotopes in the soil down there means that cameras are iffy... maybe 20% of them not working at any given time.

The labor shortage in America is so bad that you simply can't have enough prison guards to look after all the people on suicide watch. These coincidences are just Occam's razor.