Enhancement of security measure inside the central prison is taken in hand by the installation of jammer in order to bring to attention any illegal mobile usage by the inmates. This installation process is already underway. The jail authorities have planned to install the jammer at the high security block where a certain set of high-profile criminals have been lodged. The equipment will be activated before the end of this month. The installation of jammer is in addition to the CCTV system, scanner and door frame metal detector. The jammer’s coverage would be around 100 meter radius from the spot it is installed, said the authorities. The outer periphery is guarded by the armed Tamil Nadu Special Police personnel, while the jail officials take care of security and surveillance inside. The CCTV units are connected to the chamber of the Superintendent of Prison to keep a tab on the movements taking place inside.