I haven't been in so long so I didn't know if they still did. But it's smart on their part not to since the Aurora, CO shooting was in a Cinemark and maybe would've been helpful if some were able to carry, not saying it would've kept anything from happening at all but no telling how much death and injury could've been avoided.Tinseltown does not have any 30.06 or "No guns" signage, although they used at some point, but it's not there any more.
AMCs had something up a long time ago but I don't think it was a legal sign. I've not seen one recently.
I don't look for 30.06 signs, they find me. I must not get out much, in all the time I've carried I can count on one hand legal 30.06 signs I've noticed.