tenth edition of the annual course , ` exorcism and prayer of liberation , ' sponsored by the vatican congregation for the clergy , the department responsible for overseeing matters regarding priests .
the vatican has gathered a team of experts including practising exorcists to give ordinary catholics the tools needed to recognise a case of demonic possession when they see one .
more than 40 years after the exorcist left cinema audiences green , the vatican are training up ordinary doctors , teachers and psychologists to cope with a rising tide of demonic possessions .