Tennessee Code Title 33. Mental Health and Substance Abuse and Intellectual and Developmental Disabilities § 33-6-305

(1) another physician examines the person and confirms the determination of the first examining physician under § 33-6-304 within twelve (12) hours after the time the person arrived, AND

(2) the person is admitted to an extended observation bed for observation, care, and treatment,

THEN

(3) the person may be detained under this part for up to seventy-two (72) hours from the time the person arrived at the treatment resource.