When the Singapore constitution was written, it did not include a right to privacy and the subsequent data protection act does not protect citizens from government-sanctioned surveillance. The government does not need prior judicial authorisation to conduct any surveillance interception, and documents that restrict what officials can do with personal data are classified. In a U.S State Department report in 2015, it is believed that law enforcement and government agencies have extensive networks for gathering information and conducting surveillance. A majority of Singaporeans are widely aware that authorities track telephone conversations and the use of the internet of civilians, and indirect routine checks are usually done on some government critics.