A twisted care assistant who filmed himself as he raped four vulnerable women has been jailed for 21 years. Joshua Springer, 36, was initially arrested on suspicion of committing one rape last summer, after a colleague interrupted him as he carried out an attack. Lincoln Crown Court heard that further offences were uncovered after Springer confessed he was a rapist to his mother, who contacted police. Detectives today confirmed "his offences related to three victims who were suffering from