Rule 406. Habit; routine practice.
(a) Habit and routine practice defined. A habit is a person's regular response to a repeated specific situation. A routine practice is a regular course of conduct of a group of persons or an organization.
(b) Admissibility. Evidence of habit or of routine practice, whether corroborated or not, and regardless of the presence of eyewitnesses, is relevant to prove that conduct on a particular occasion was in conformity with the habit or routine practice.
(c) Method of proof. Habit or routine practice may be proved by testimony in the form of an opinion or by specific instances of conduct sufficient in number to warrant a finding that the habit existed or that the practice was routine.