The real question isn't about injuries....it's about your life. Wearing a seat belt saves thousands of lives per year and if you don't care about being a statistic and seeing your loved ones mourn over your loss, then don't wear one and give a funeral director your business. I've worn a seat belt ever since they first came into being in the early 1960's and when I got my first car, a 1970 Ford Bronco, in 1974, my parents immediately paid for having a roll bar installed as an extra preventative measure in case it rolled. I feel naked if I don't have my seat belt fastened. This isn't about defying big brother and the legislators, its about being safe and taking advantage of the tools and technology given to you.
On the subject matter at hand, back in the early 80's, a buddy of mine and I were driving from Vancouver to Banff and my buddy was stopped and ticketed for speeding. As my buddy had a Calif license, the officer volunteered that if he was not going to be returning to Canada in the next 3 years, he could avoid paying the fine and the ticket would drop off and disappear. The fine was never paid and nothing ever happened as a result.