Sec. 71.029. Maps as Evidence of Location or Area
(a) In a prosecution of an offense for which punishment is increased under Section 71.028, a map produced or reproduced by a municipal or county engineer for the purpose of showing the location and boundaries of gang-
(b) A municipal or county engineer may, on request of the governing body of the municipality or county, revise a map that has been approved by the governing body of the municipality or county as provided by Subsection (a).
(c) A municipal or county engineer shall file the original or a copy of every approved or revised map approved as provided by Subsection (a) with the county clerk of each county in which the zone is located.
(d) This section does not prevent the prosecution from:
(1) introducing or relying on any other evidence or testimony to establish any element of an offense for which punishment is increased under Section 71.028; or
(2) using or introducing any other map or diagram otherwise admissible under the Texas Rules of Evidence.