Similar in Texas, the two types of signs I see are
1) the (paraphrased ) “if you don’t have a permit don’t bring it in here, per section 30.06” (yes, there IS a section 30.06 :D )
2) the (paraphrased) “even if you DO have a permit, don’t bring it in here” most often seen in court houses, federal establishments, etc where it isn’t allowed anyway.
Was in Austin last week. Sign number 2 is EVERYWHERE!