Hand II

That death generally occurred within twenty-four hours of the patient's arrival at the killing center. Under T4 policy, a doctor had to do the actual killing, in accordance with the motto enunciated by Dr. Viktor Brack, head of the Chancellery's "Euthanasia" Department II: ''The syringe belongs in the hand of a physician.'' Rather than a syringe, however it was usually a matter of opening a gas cock.
--Robert Jay Lifton, "The Nazi Doctors: Medical Killing And The Psychology Of Genocide", p. 71