Ah, lying to the real Police could bite you. You don't have to volunteer information however I'd suggest telling an officer who asks if you have any weapons that a reply of "No, but I do have a POCKET knife" is the correct response.
Best.
This. Know your own laws.
I happen to be a criminal defense attorney who sees this a lot. Officers often don't even know their own laws, literally. They will make a criminal citation where none is warranted, believing they know the law.
I happen to be in WA where the knife laws are vague. There is no set length that allows you to know you are safe. I see constant reports where pocket knives are not charged.
They do like to charge for "spring knife" when the knife is actually an assisted knife. I have the prosecutors trained now, on what that means. Used to be I had to show them the federal import statutes, and convince them to dismiss. Now, the WA statute mirrors the federal statute and specifically exempts assisted knives from being considered spring knives or switch blades. However, the rule actually will protect anyone carrying a knife that has a "bias toward closure" meaning that knives that an officer might be able to flip open with a hard flip and wrist action will not be a gravity knife any more as long as it has a force keeping it closed that has to be overcome.
There is a catch all in the statute, concealing any object apparently capable of producing serious bodily harm. There is argument that this is unconstitutionally vague, but I have seen it charged, prosecuted, and a finding of guilty imposed enough to advise against it. (for people who think that carrying a hammer under their coat in a sheath, or a large screw driver, etc concealed.
Where I am at, there is also a way for officers to charge you if it is not concealed, if it is a weapon carried in a manner that would cause a reasonable person to be alarmed (IE, it is legal to carry firearms openly, but you may be stopped and charged if some one freaks out. Same for a knife on your belt).
Typically you are ok, if you are not up to no good. A gentleman was walking around Walmart here locally with his pistol on his belt, and no one paid him any mind. If he had been acting strange, or shifty, it might not have been the same story.