Tenn. Code Ann. § 33-6-421

The chief officer shall file with the court, by the time of the probable cause hearing, certificates of need for care and treatment from two (2) licensed physicians or one (1) licensed physician and a psychologist qualified under § 33-6-427(a), certifying that the defendant satisfies the requirements of § 33-6-502(1) -(4), and that if involuntary treatment is not continued the defendant's condition resulting from mental illness or serious emotional disturbance is likely to deteriorate rapidly to the point that the defendant would be again admissible under § 33-6-403, and showing the factual foundation for the conclusions on each item of the certificates.