In some circumstances, an official investigator may be at risk if she mis-identifies herself in an Internet forum. She may be acting unethically, or may be compromising the credibility and admissibility of the evidence she is collecting http://legal-beagle.typepad.
"law is designed to crack down on cyber-bullying and would apply to cases like that of Elizabeth Thrasher"
- California bans malicious online impersonation - Computerworld (view on Google Sidewiki)