HELP

I work for a law firm and i asked our office administrator can i see my personnel files and she told me i couldn't see it. That is baffling me because any other firm I have worked at you can see your file in the HR dept and can't take it out. I was evaluated 12/00 and have not even seen my evaluation and wanted to see it and haven't as yet. Is there a law that states i can see my personnel file and/or evaluation? Please let me know. Any attorney can write what he would like about you in memo form and you are not cc'd on it or don't know it is in your file which i also think is against the law. This firm has no policy and procedure manual but evaluations help you fix the areas that you are lacking in and helps you become a better employee. PLEASE help me with this question and where can i look to see if there are any cases about this situaiton. All employees are trying to see their files and she won't let any of us see it. I wonder why. Thank you.