So I have turned my place inside out and it comes down to the dog eating it or just falling out of my pocket. (more likely the latter) My main concern is that someone else may have found it in the area and can take my car for a joy ride. So, is there a way I can make that key useless on my CTS? Mine is a 2014 if that makes a difference vs. the 2015. If there is a way I can do it, that would be awesome. Otherwise, I would take it in for the peace of mind. I am not in the most trustworthy of areas. I appreciate any help I can get!