This paper is focused on studying the current situation of the new media technologies use by federal and state courts, judges and jurors, and the effects of the new media on the courts in the United States. Although new media use by courts, judges and jurors is not common in the United States, Their improper use of new media on conducting research, investigating facts and communicating with others about the case has negative effects on court proceedings, ethics and conduct of judges and court employees and courts’ ability to promote understanding and public confidence of the judicial branch, which finally leading to mistrials. Facing the challenges, the courts have adopted or amended some instructions for the judges and judicial ethics rules for the jury on the use of new media as major measures.