Additional Pointersand Readings
http://cert.org/tech_tips/passwd_file_protection.html
http://csrc.nist.gov/publications/nistpubs/80010/node31.html
www.cert.org/tech_tips/intruder_detection_checklist.html
www.networkcomputing.com/1123/1123fl.html
Also, when checking related case law, see the following:
United States v. Maxwell, 43 Fed. R. Evid. Serv. (Callaghan) 24 (U.S.A.F. Ct. Crim. App. 1995)