I think the best way to be safe is to teach the proper safety practices and enforce them strictly. Make sure blade guides aren't too loose, make sure the blade guard is close to the top of the material you are cutting, use a fence for parts, use a good blade, tension the blade properly, etc. You can sometimes use a plastic or wooden piece to push parts through the blade to avoid getting fingers close to the blade. And obviously make sure the blade you are using is appropriate for the material you are going to cut.
Everything here -
http://www.cs.rpi.edu/twiki/pub/Robo...dsawSafety.pdf