I was asked by a friend to respond to this thread because I currently work for TABC. This was in response to the original question about bars within restaurants, but seeing how the thread has changed slightly, I will try to respond to both main questions.
To get the correct answer on the bar versus restaurant question, I went to our licensing and enforcement divisions to verify the information. I was told that there are two different things to consider - whether or not it is a hotel or a separate building.
If the permitted premise is a hotel, all bets are off and almost anything can happen. The hotel rules have gotten fairly complex and allow things that are not allowed elsewhere. In this case, it is possible for a hotel to have a restaurant that serves drinks that is not posted as 51 and a bar that is posted as 51% if it is in a separate room. This is true because almost all hotels set up the food and bar as separate businesses, and the room service and mini-bars make it even more confusing.
But looking at the places like Chili's, it is much simpler to determine. Assume a restaurant is in one building and has a bar as part of the restaurant. It is possible for the bar permit to draw off the food portion of the building for a separate permit. This can only happen if the two businesses are not related however, such as a restaurant subcontracting out the bar. If it is one owner, then they can only get one permit.
The real trick is if the bar is separately permitted, then it cannot serve or sell any food in the restaurant. For the restaurant to serve would require it to have a separate permit. And if the restaurant does have a separate permit, it would need a separate bar with a separate liquor service and all, because the bar cannot sell drinks to the restaurant for resale.
The last part is because the state of Texas has what is called a three tier system for alcohol and it strictly separates the manufacturer, wholesaler, and retailer tiers. A person or business who has a retail on-premise permit cannot sell for resale and cannot sell off their premises. No business can have both a wholesaler permit and a retail on-premise permit.
Thus, if it is not a hotel, it is generally safe to assume that if it is a place like Chili's which sells food and alcohol, the bar is not going to be legally a 51% place for you to worry about. If the bar is in a hotel, it should be posted by the doors to the bar if they are going to have the 51% rule. If it is not a separate room, it is safe to carry there since it would be harder for anyone, including the police, to determine exactly where the premises are for the rule to apply to.
In answer to the second main question, the law is clear on what constitutes carrying while intoxicated. In Chapter 46, it says that it is illegal to carry under the authority of the CHL while the person is intoxicated. There is no general definition of intoxicated in the Penal Code and none in the chapter on weapons. The general rules of construction for the penal code would say that if it is in general use, you could use the general definition, or if it is defined elsewhere in a manner that is not in conflict with the general definition, to use that definition.
Chapter 49 is in the same title as chapter 46 and has a definition of intoxicated. Since this definition is more strict than the general definition (drunk) but not in true conflict with it, the court would use it as a guideline. Thus, intoxicated means to have an alcohol concentration of .08 or higher OR to not have the normal use of their mental or physical faculties due to the introduction of some intoxicant (alcohol, drug, illegal substance, or any other substance, which could include legal and normally used drugs).
For any officer to arrest you for unlawfully carrying by a CHL, based on the carrying while intoxicated law, he would need to be able to show either
1. a factual alcohol concentration (blood, urine, or breath test) OR
2. A. that you were not in possession of the normal use of physical or mental faculties AND
B. that this lack of use was due to the introduction of an intoxicant.
The officer can show this by giving a field sobriety test or by simple testimony of your actions. It is important to note that the law does not require the use or possession of YOUR faculties, but of normal ones. This is much easier, since all I need to do then is show that you were not acting in a socially acceptable and normal fashion. Then I need to show that this is because of the intoxicant. One great example of this was the arrest of a woman in a bar for P.I. because she was standing on the table top, taking her blouse and bra off, and screaming that she would have sex with every (not any but every) man in the bar. This was probable cause that she was intoxicated since this is not considered to be normal use of mental faculties. Her defense could be that it was not due to the alcohol but due to her being manic. I have yet to hear anyone admit to behavior like this in court as being normal or caused by anything other than intoxicants though.
So, it is not illegal to carry after having one or two drinks, unless you lose possession of what faculties society deems to be normal very easily.