An injection system for medical examinations to control the manual injection of a substance into a patient with a manually operated injector that has an arrangement to detect the fill state of a container filled with a substance to be injected. The sauce composition makes use of oil encapsulated solids in a system comprising oil, water, and flavoring ingredients as required by a frozen dish wherein it is incorporated. Once these keys are identified, the users who own these keys may then be identified by consulting an association of keys to users, which may be updated immediately upon the addition of new keys.