There's now more evidence to confirm that the powder found in a senate office this week does contain a deadly poison.
Results of genetic testing by the Centers for Disease Control and prevention show the presence of ricin in the powder.
Three Senate office buildings remain closed as investigators examine mail. So far, they haven't found a specific letter they could link to the powder.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or email@example.com.