By Daniel Tkacik People serving time in prison or jail in the United States, which has the highest incarceration rate in the world, are almost constantly being monitored. The surveillance even stretches into communications between inmates and their relatives. “You gotta be careful what you say,” said a relative of an incarcerated person, who was interviewed in a new study authored by Carnegie Mellon University CyLab researchers. The study, which explores people’s understandings, attitudes, and reactions to prison surveillance, received an Honorable Mention award at this week’s Association for Computing Machinery (ACM) Computer-Human Interaction (CHI) conference , held virtually.