TexasCHLforum.com

The answer really is simple. The law gives a minimum level that must be obeyed. Any property owner, including the government, may make stricter rules than the law specifies, but they cannot make less strict rules. There may be certain exceptions, such as a law banning a local government from making rules about firearms.

This is very similar to the rules on discrimination. There are laws that forbid my discriminating against people for certain reasons, such as race or religion. But I may still discriminate against them for other reasons, such as clothing worn. (I am still working on getting the Church of John Moses Browning recognized by the federal courts, but not having much luck.)

And the answer to your other question is that the deputies were correct about you violating the Penal code, or being about to. Section 30.05 makes it illegal for you to enter a building after receiving notice that it was not allowed. If you saw a sign saying you could not enter with a knife and then did so anyway, you have committed a crime.