Propanolol has been used for many years to treat high blood pressure, it comes with a long list of side effects and contra-indications.

All sounds a bit spooky to me though, memory altering, removal or implanting. Very CIA.

Having said that it is used to treat hyper-tensives, surely then if they used it daily for long periods then sooner or later they would forget to take it and be back at square one.