Julie,
Longtimefan has a good point. Mail that letter AND send one to the police department/juvenile officer or someone who deals with minors, and an attorney.
As frustrated as we may get with the school systems, things have changed over the past number of years.......most not good for schools. The first words many kids learn today are,"I'm gonna sue you!" Administrators are scared to death of being sued...it's like an engineer having one of his bridges collapse. It ain't going to help your career.
The Privacy Act, good as it may be, has crippled what schools can let out on discipline, etc. and students names in particular. Again, the administrators fear the word "sue."
Don't worry about being the nagging parent. There are probably several others there that are just too afraid to do or say anything. Be that one who does something about it.
And if all else fails, teach your boy how to break a cement block with a forehead butt, give a school demonstration, and look the bully right in the eye and have him mouth the words......"You're next, Jellybrain."
Anyone for a Weenie Roast?