The National Association of School Nurses has a private school interest group that also has its own listserv. Go to www.nasn.org for more information. Ther is lots of good information on tha website and in the Journal the comes free with membership.
The green legal book by Schwab and Gelfman is applicable to public and private. www.mcgill.com sells it. Schwab & Gelfman (2001). Legal issues in school health services: A resource for school nurses, administrators and attorneys. North Branch, MN: Sunrise River Press.