51%????

[CoveRuger]

I went to Six Flags/Fiesta Texas this week and noticed that several kiosks in the park had 51% signs posted. This seems strange since carry in the park in prohibited and the booths that had these signs did not seem to sell enough beer/other to deem the use of the 51% sign. Has anyone else noticed these signs?

As a side note, security at 6-Flags was more thorough than at Sea World. Metal detectors at the gates at 6-Flags, but none at Sea World.