Answer:
psychopharmacological model
Step-by-step explanation:
Based on the description provided regarding this specific scenario it can be said that the model that best describes Todd's behavior is the psychopharmacological model. This model of violence revolves around the physiological process of ingesting a psychoactive substance which can lead the user to a volatile, unrestrained state that precipitates a violent act. Such a state like the one that Todd was in when he shot and killed the unarmed man in his own home.