Yahoo!Messages vs Yahoo!Email, which one is legally admissible?
Any threats communicated by use of a computer whether through email, chat or blog posts or Yahoo Answers can be legally admissible in court. When part of an investigation, law enforcement can obtain the user name that is connected with the registration name on the yahoo account. Yahoo can then through their own will or with a warrant can obtain the IP address and track down the original user who communicated threats. The court does have the option to waive such evidence as inadmissible but that is up to the judge.