Unless so,ething has changed recently in CA, a knife worn on a belt in a sheath is not concealed, even if covered by a shirt or coat. Tuck said sheath into a pocket and then cover it, it is concealed. If stopped and asked about weapons, say " I have no weapons, but I am carrying a knife." Explain that it is a tool. The word weapon will get you popped right now. If asked why you told him if it's not a weapon, explain that for your safety and his, he needed to know, even though it isn't carried as a weapon. That rather falls aoart at 0200 in a bar fight, so don't be foolish.
Gene
Retired CA LEO