What Ray did was more along the lines of voluntary manslaughter and yes, he'd lose his job at a minimum and of course stand trial if they chose to prosecute.
However, if you really believe that CSIs break down doors, shoot at suspects, tell the detectives what to do, interrogate suspects, etc, then why would you not believe that Ray could get off with nothing more than a slap on the wrist? CSI is not about the real world. It's about entertaining drama and the writers are going to do whatever they want to tell a good story.
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