I maintain that the statute was not intended, nor has it been interpreted to enforce discreet conditions under which the property may be entered, or behaviors (some not even apparent) that are allowable vs. prohibited. It's more binary. You can't come on the property, it's posted, or marked, or fenced. Or you can, it's open displaying wares for sale to the public, etc. The NOTICE requirements ARE specific in the statute.
"A sign, reasonably likely to come to the attention of INTRUDERS....that ENTRY IS FORBIDDEN".
Again, my point is that a two word declaration "no weapons" with no further clarification, or a pictogram of "no fat girls" on the KA frat house doesn't clearly forbid entry to an open business or frat house having an open party. I gave an example previously, of a sign specifically invoking PC 30.05 and laying out the conditions of entry to the parking lot. I actually still don't think that meets the intent of the statute for the reasons stated above...but perhaps not as clear.
If the owner SUBSEQUENTLY wishes someone to leave for observed or "perceived" behavior (eating too much!), they can use oral notice to prohibit someone from the property.
The assumption that a generic sign stating a "rule" meets the NOTICE requirement in 30.05 is not valid (in my opinion). If I'm wrong and ANY SIGN with generic prohibition on ANY behavior invokes criminal trespass in a location that is otherwise open, then you get unreasonable results.
"No (concealed) briefs"
"No cops"
"No Republicans"
"No fat chicks"
"No hippies" (long haired freaky people need not enter).

Ignoring all the above brief declarations or pictograms on a business now constitutes a class B misdemeanor with a fine and/or imprisonment for up to 6 months as the penalty.
As soon as I get done typing this, I'm going over to my rental house where my tenant is 1 day late on his rent and post a sign saying "No deadbeats", I'll then call the police to arrest him for trespass, avoiding all the stupid rules about eviction.
