Well... Acumen is our warden, even if he is a machine.
[She picks up on the annoyance, and for some reason, she kind of... feels sorry for him.]
I think it wants to be able to follow our lifesigns so the Defense Force can watch over us. And the bots help us with our day to day tasks. I'd understand if he decided to take away an ability that would be harmful to him or to the other inmates...