(a) A district attorney, criminal district attorney, or county attorney may collect a fee in an amount not to exceed $500 to be used to reimburse a county for expenses, including expenses of the district attorney's, criminal district attorney's, or county attorney's office, related to a defendant's participation in a pretrial intervention program offered in that county.
(b) The district attorney, criminal district attorney, or county attorney may collect the fee from any defendant who participates in a pretrial intervention program administered in any part by the attorney's office.
(c) Fees collected under this article shall be deposited in the county treasury in a special fund to be used solely to administer the pretrial intervention program. An expenditure from the fund may be made only in accordance with a budget approved by the commissioners court.