A relentless serial rapist who police believe sexually assaulted hundreds of women has been transferred to a lower security prison. Selva Subbiah (inset) has been moved from maximum-security Kingston Penitentiary to medium-security Warkworth Institution, near Campbellford, Ontario, sources tell me. Corrections Canada routinely cites privacy rules in refusing to discuss decisions about where criminals are imprisoned. Subbiah was convicted of beating, drugging and raping more than 30 women, although police investigators believe he attacked at least 500 women, and perhaps as many as 1,000. Police fear many women never knew for certain that they were victims because Subbiah used powerful drugs to render his victims unconscious before he molested and raped them.