Just thought I'd bring this back up. There was a Taco Cabana thread on
http://www.thefiringline.com. A few months ago, I visited one local Taco Cabana, and there was nothing on or near the entrance. On a board near the menu, where they post their food licenses and such, there was a non-30.06-compliant "no guns" sign. I wrote to Taco Cabana via their contact info on their website telling them about it, but not specifying which location. I wanted them to have to check them ALL and figure out which ones are posted incorrectly. I got a reply, and I wrote back, including my phone number. I actually got a call from a Taco Cabana representative, and, while being very polite, I disagreed with their policy, and told them that their signage is useless. She thanked me, and offered a gift card from them. I told her that while I wouldn't go in a Taco Cabana that's properly posted, I might run through the drive-thru. I got the gift card ($25), and have since visited two other Taco Cabanas, which were also improperly posted. I went in, ordered my lunch on their dime, and ate - all while carrying.
A not-so-humorous thing happened a month or so ago: A guy was shot to death while waiting in line at a Taco Cabana somewhere around Dallas I believe. I copied the story, and sent it to the Taco Cabana rep, and said I guess their drive-thrus aren't a safe place to be, either.