TexasCHLforum.com

It seems to me that the OP reference to Enhancement makes me think he is referring to the Texas weapon-free school zone not the Fed.GFSZ

PC §46.11. PENALTY IF OFFENSE COMMITTED WITHIN WEAPON-FREE SCHOOL ZONE.
(a) Except as provided by Subsection (b), the punishment prescribed for an offense under this chapter is increased to the punishment prescribed for the next highest category of offense if it is shown beyond a reasonable doubt on the trial of the offense that the actor committed the offense in a place that the actor knew was:
(1) within 300 feet of the premises of a school; or
(2) on premises where:

(A) an official school function is taking place; or
(B) an event sponsored or sanctioned by the University Interscholastic League is taking place.
(b) This section does not apply to an offense under Section 46.03(a)(1).
(c) In this section, “institution of higher education,” “premises,” and “school” have the meanings assigned by Section 481.134, Health and Safety Code.