Kevin Cobb, a 38-year-old nurse who worked in the casualty department at St. Peter's Hospital in Chertsey, Surrey, England, was convicted in May 2000 of one count of manslaughter, two counts of rape, and four counts of drugging women with intent to rape.  Cobb injected patients with midazolam, a powerful sedative, which causes short-term memory loss.  It also resulted in the death of fellow nurse, Susan Annis.  Cobb had slipped the drug into her cider while they were eating, intending to rape her after the drug took effect.  Instead, Ms. Annis, who had a minor heart problem, collapsed and died. Cobb portrayed himself as a hero, claiming he tried to revive her, and was seen crying at her funeral.  He might have gotten away with it, but then Janine Cuddington, a patient, complained that she lost consciousness on a hospital gurney and awoke to find herself being raped. She immediately went to the police, who did tests and found traces of midazolam in her blood. Her immediate action was a key factor, as midazolam cannot be detected after 8 hours.   After the police had been notified, two more victims came forward.  Cobb received seven life sentences, but remains a suspect in half a dozen more such rapes.