From their (Lubbock ISD) student handbook pg 12
Students with Food Allergies
Recognizing that students with food allergies can face serious risk if exposed to certain foods, the school will take appropriate measures to limit the risk for all children with food allergies. Any parent whose child is allergic to certain foods must immediately notify the school regarding the food allergy in order to establish an emergency plan and other measures required for the safety of the student.
So, not so "voluntary" per that little blurb.
No mention of 504, however.
Worthy of note that the 504 info at that district site is NOT easy to put fingers on and read . . . though that's not a surprise.