Some states have a law specifying that a sign is considered notification. In those states they usually have criteria for those signs, ie. Size, design, wording. Delaware has neither.
Even in federal buildings where carry is prohibited by law, define how and where the sign must be posted. Neither the sign nor the law is sufficient by itself.
Stop and look at people entering a public place. Notice how they enter, talking to others, on their phone, or even strolling through the door alone. How many of them can you say definitively looked at, noticed, read, and understood the signs on the door?
What if, as the owner of a swanky taco joint, I decided I was tired of scraping gum off the bottom of my tables and placed a “No GUM Chewing” sign on my doors? Would I then be able to call the police and demand that they be arrested for gum chewing (legal) or trespass because they ignored my sign? Now if having seen the person chewing gum, I approached the person and informed them that they would have to leave the premises for failure to follow house rules, and they did not leave, then I could call the police and have them trespassed
It is sobering to reflect that one of the best ways to get yourself a reputation as a dangerous citizen these days is to go about repeating the very phrases which our founding fathers used in the struggle for independence. - Charles A. Beard
George