https://humansbefree.com/2015/09/bill-coopers-1991-book-predicts-shootings-by-drugged-individuals-in-order-to-disarm-public.html

Back in 1991 Bill Cooper, a Navy Intelligence Asset revealed in his book how the CIA was Creating School Shooters using drugs and hypnosis on mentally disturbed individuals.  The book was Behold a Pale Horse and is available on amazon, ebay, thrift books and alibris.com