(a) In a county in which the sheriff regulates alarm systems under this subchapter, a person may not use an alarm system without a permit issued in accordance with this subchapter.
(b) This subchapter does not apply to:
(1) emergency response systems managed by health care facilities licensed by the Texas Department of Health; or
(2) alarm systems installed on:
(A) a motor vehicle;
(B) premises occupied by the United States, this state, or the county; or
(C) premises located in an incorporated area within the county.