Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
By touching a cell phone, car keys, or even a pen, you are leaving behind a chemical signature that can reveal much about how you live your daily life.
Identifying a car, truck, or other vehicle that has been involved in a hit-and-run accident often depends on examining paint fragments left at the scene by the vehicle.
