To establish probable cause under Section 1102.001, the court may require:
(1) an information letter about the person believed to be incapacitated that is submitted by an interested person and satisfies the requirements of Section 1102.003; or
(2) a written letter or certificate from a physician or psychologist who has examined the person believed to be incapacitated that satisfies the requirements of Section 1101.103, except that the letter must be:
(A) dated not earlier than the 120th day before the date of the appointment of a guardian ad litem or court investigator under Section 1102.001; and
(B) based on an examination the physician or psychologist performed not earlier than the 120th day before that date.