As others have mentioned, there is some dispute on what constitutes "grounds." I believe the statute taken as a whole indicates the activity has to be occurring on grounds owned by the school, as all of TPC §46.02(a) deals with schools. The buildings are school buildings, the transportation vehicles are the schools'. (If school children ride a city buss to the zoo, the bus would not be off limits to CHLs because the buss is not "a transportation vehicle of the school, . . .") Further, the statute allows the carrying of firearms in such places, with "written authorization" of the institution. It would be quite a stretch to presume that the Legislature intended the school to have the authority to authorize the carrying of firearms on someone else's property. When read in its entirety, as we are required to do, I believe TPC §46.02(a) applies only to school property and school vehicles.
But as noted, this is a gray area; the cutting edge of the law where many people find themselves bleeding to death.
Chas.
TPC §46.03(a) wrote:§ 46.03. PLACES WEAPONS PROHIBITED. (a) A person
commits an offense if the person intentionally, knowingly, or
recklessly possesses or goes with a firearm, illegal knife, club,
or prohibited weapon listed in Section 46.05(a):
(1) on the physical premises of a school or
educational institution, any grounds or building on which an
activity sponsored by a school or educational institution is being
conducted, or a passenger transportation vehicle of a school or
educational institution, whether the school or educational
institution is public or private, unless pursuant to written
regulations or written authorization of the institution;