(a) Drug enforcement funds shall be used only for direct expenses associated with the investigation of the criminal drug laws of this state, including without limitation:
(1) The purchase of evidence;
(2) The payment of informants;
(3) The relocation or security of witnesses, or both;
(4) Emergency supply purchases; and
(5) Emergency travel expenses.
(b) Drug enforcement funds shall not be used for:
(1) Equipment purchases or leasing, salaries or wages, professional services, training, or any other purpose not directly related to a criminal drug investigation; or
(2) Administrative costs associated with the sheriff's office.