You would have to be a bit more thorough in that evaluation. Think of a person in your life who doesn't know anything about knives. Would they be able to look at it and know it's a knife? Better yet, put it in your pocket and ask them.So, if the clip and butt of my Microtech are visible at the top of my pocket, it's not concealed?
Also don't engage in criminal behavior and thereby give the police a reason to be going through your pockets in the first place.