On 21/05/2013,
you requested for the version in force on 21/05/2013
incorporating all amendments published on or before 21/05/2013.
The closest version currently available is that of 30/03/1987.
An Act to provide for the internal security of Singapore, preventive detention, the prevention of subversion, the suppression of organised violence against persons and property in specified areas of Singapore, and for matters incidental thereto.