Experiment 13

Type: Surgeons of Kirkwood 
Experiment 13 is an ongoing medical experiment being conducted by the Surgeons of Kirkwood. Supernaturals are captured and implants are placed in the skull, between the eyes and brain. The implants allow a 'controller' (one of the servants of the Surgeons) to see what the Supernatural sees and type instructions which show up in their field of vision.
If for whatever reason the implanted Supernatural attempts to remove the implant, is captured or compromised, the controller can activate the implants kill switch. Kill switches are usually poisons or explosives, depending on the type of Supernatural. 
Being made subject to Experiment 13 is horrendous. These implanted Supernaturals are forced to commit crimes and run missions for the Surgeons under threat of imminent death. Trying to find a way to remove the implant is dangerous, since everything they see... their controller can see as well.