(a) A private or confidential investigator employed to determine the attendance at or the number of paid admissions for a motion picture theater performance shall furnish to the owner or general manager of the theater:
(1) a report of the investigator's findings on the day after the date of the determination; and
(2) a written copy of the investigator's findings or report not later than the third day after the date of the determination.
(b) If an investigator does not comply with Subsection (a), evidence obtained by the investigator and the investigator's testimony is not admissible as evidence in any court or other proceeding.