Can't use undue force? Match force with force used against you...hmmmmm? Well, all I can say is that I carry a "assisted opening" knife clipped to my pocket at all times. It is not a switchblade and it is not illegal. It is easy to open with one hand and my primary reason for a knife such as this is while boating. It is a necessary tool and may likely save my life in certain circumstances. However, when walking downtown in precarious areas or other areas of this lovely town where criminals may tread, my hand stays very close to that pocket. To the very best of my ability, the thug that attempts to attack me will have to stay behind trying to collect his intestines from the sidewalk. I will not wait to see if he happened to bring his club, knife or gun during his attempt to attack me! Now, lets bring this on in front of 12 of our peers, huh?