All States allow juveniles to be tried as adults in criminal court under certain circumstances. Transferring juveniles to criminal court is not a new phenomenon. In some States, provisions that enabled transfer of certain juveniles to criminal court were in place before the 1920's.
A digital signature (not to be confused with a digital certificate) is a mathematical technique used to validate the authenticity and integrity of a message, software or digital document. Download this guide to become a Web App Security superhero.
The icon you are referring to is in the Security section and indicates that the message has a Valid Signature : If you Open the message and then click on this icon you can find more information about the digital signature. See View a digital signature in a signed e-mail message for more information.