Number of years and level of educatuion is really dependent on how far YOU want to go and what the agency requires. However, the higher degrees will normally get you the job faster. When it comes to the perks, you would have a job that not everyone does. It is a very specialized trade with very special tools. You would have the ability to keep innocent people from being sent to prison for crimes they didn't commit. You would also be able to help catch the guilty ones and have them locked up. And one of the biggest perks is you would be able to bring closer to the family of crime victims. It isn't the best in pay, it's often messy, very dangerous on any level but even more on a biological level.