Deadly Martial Arts Techniques

How can you test a Martial art’s effectiveness?
I’m a newbie. I know sparring is a common answer but it seems that alot of safety rules limit the amount of things you can test in sparring. i.e. How do you test deadly techniques that cant be used in sparring and how do you defend against such techniques? Or atleast in general, how can you test yourself to see if the martial art you practice will work on the street?
Thank you, all your answers were very informative. Even the alabama one. ; )
When competing, you can never compete one style versus another, only one student versus another.
If two students enter the ring with the both of them having equal time to train. You still are not comparing styles but teachers.
If these two students were trained by the same instructor in two different styles with same time to train. It still is not the style, but the style the instructor likes (or understands) the best.
This is why I say, look for a style and school that you enjoy training at and will stretch you. This will keep you interested and pushing hard, and that will make you a great fighter.
Deadly Martial Art – Karate ( Part 1)