I think you have brought up a number of good points in your analysis and I like your hypothetical "test case". Here are my thoughts. Oh, and as you may have seen from my previous posts, my opinions are many and varied...and worth what you paid for them (if not less).
When I choose to carry, I make my best effort to follow the law as I understand it, and as it has been applied in the few cases where it has come up. I am less concerned about the intent/desires/opinions of property owners or public officials, unless they are legally relevant. In your test case scenarios there are two laws at play that could conceivably result in a criminal prosecution. However, I don't believe prosecution for either would be successful.
The first statute is Texas PC 30.05 "Criminal Trespass" and the second is PC 30.06 "Trespass by a CHL Licensee". You have dispensed with 46.035 based on your hypothetical "accidental exposure", so I won't go into that.
Let's start with 30.05...
So let's say you walk up to a building you see a sign that says NO TRESPASSING on the door. That's notice that "entry is forbidden". So if you went in you'd be violating 30.05. Let's say you walk into a store and you see a list of "rules"... NO SKATEBOARDS, NO BALL CAPS, NO GUNS. I guess you could argue that if you had any of those items, then you received notice to depart. I'm not convinced that the trespass law is designed to allow for criminal enforcement of a list of rules, but for the sake of argument, let's say it does.PC §30.05. CRIMINAL TRESPASS, (a) A person commits an offense if the person enters or remains on or in property of another, including residential land, agricultural land, a recreational vehicle park, a building, or an aircraft or other vehicle, without effective consent and the person:
(1) had notice that the entry was forbidden; or
(2) received notice to depart but failed to do so.
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Also, let's say you were carrying a concealed handgun and you have a CHL, but no ball cap, and no skateboard. Here's the problem with prosecuting you under 30.05... you have a statutory defense.
While a Defense is not the same thing as the law being inapplicable, it precludes successful prosecution unless the prosecution can refute "beyond a reasonable doubt" that the defense to prosecution existed. As a sidebar, carrying WITH a CHL, was only a Defense to Prosecution under 46.02 until 1997.PC §30.05. CRIMINAL TRESPASS
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(f) It is a defense to prosecution under this section that:
(1) the basis on which entry on the property or land or in the building was forbidden is that entry with a handgun was forbidden; and
(2) the person was carrying a concealed handgun and a license issued under Subchapter H, Chapter 411, Government Code, to carry a concealed handgun of the same category the person was carrying.
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So my argument is that a Licensee can not be successfully prosecuted under 30.05 if the reason for his exclusion from the property was that he was carrying a concealed handgun. This is regardless of what type of "notice" he received, even a valid 30.06 notice still doesn't get you prosecuted for 30.05.
All right, now that a 30.05 prosecution is negated, lets see what can get you under 30.06.
So you walk into a store past a gunbusters sign, or a NO CONCEALED GUNS OR SKATEBOARDS, or a 30.06 sign in 6 point, Times New Roman font, on the ceiling. My argument is that you haven't received notice. The reason is that "notice" is specifically defined in the statute, and none of the above scenarios meets the definition. Nor do any of the signs described in Rick's post. The reason I say this is the definition of notice.PC §30.06. TRESPASS BY HOLDER OF LICENSE TO CARRY CONCEALED HANDGUN, (a) A license holder commits an offense if the license holder:
(1) carries a handgun under the authority of Subchapter H, Chapter
411, Government Code, on property of another without effective consent; and
(2) received notice that:
(A) entry on the property by a license holder with a concealed handgun was forbidden; or
(B) remaining on the property with a concealed handgun was forbidden and failed to depart.
I just don't see how it can be argued that you have received notice by written communication based on seeing a sign that clearly doesn't meet the statutory definitions. And you surely don't receive notice if you don't see the sign.PC §30.06. TRESPASS BY HOLDER OF LICENSE TO CARRY CONCEALED HANDGUN,
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(b) For purposes of this section, a person receives notice if the owner of the property or someone with apparent authority to act for the owner provides notice to the person by oral or written communication.
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(3) "Written communication" means:
(A) a card or other document on which is written language identical to the following: "Pursuant to Section 30.06, Penal Code (trespass by holder of license to carry a concealed handgun), a person licensed under Subchapter H, Chapter 411, Government Code (concealed handgun law), may not enter this property with a concealed handgun"; or
(B) a sign posted on the property that:
(i) includes the language described by Paragraph (A) in both English and Spanish;
(ii) appears in contrasting colors with block letters at least one inch in height; and
(iii) is displayed in a conspicuous manner clearly visible to the public.
Now for oral notice, there is no specific wording required. So if the owner says "No guns in here, you have to leave...." you could be violating 30.06. Or if he just said, "YOU, get out...." then 30.05 (whether you had a gun or not).
So that's my thought on the law. No doubt you could get arrested for some of the scenarios, but I don't think prosecution would be successful. Not aware of any cases to the contrary, but if they come up I'd like to hear about them.
-Scott