MKUltra is the code name given to a top secret CIA program of mind control experimentation on human subjects.  These experiments were sometimes performed on the general population without consent (illegal).  CIA informed congress many years ago that the program was discontinued; however the opposite is true, and the program has evolved considerably.  Here's how it works:

1) CIA selects individuals (pawns) with certain mental conditions / susceptibilities

2) CIA arranges for "therapy sessions" and the prescription of psychotropic drugs

3) CIA breaks the mind into a functional/programmable device that can triggered by mobile phone signals

4) These mind controlled pawns hear voices/demons in their heads that trigger/instruct them to commit horrible acts of violence (e.g., school shootings)