The United State Postal Service captures images of every piece of mail

A high-tech computer system that captures images of “every mail piece that is processed” by the United State Postal Service was critical in helping federal agents track the Texas woman arrested today for allegedly sending ricin-tainted letters to President Barack Obama and New York City Mayor Michael Bloomberg.
In a U.S. District Court complaint filed today against Shannon Guess Richardson, an FBI agent details how investigators traced the ricin letters back to New Boston, Texas, where the 35-year-old Richardson (seen below) lives with her husband.
The Bloomberg letter was opened at a municipal mail center in Manhattan on May 24, while the letter to Obama was intercepted May 30 at an off-site White House mail facility. A third ricin letter--sent to an anti-gun group funded by Bloomberg--was received at a Washington, D.C. office on May 26.
According to FBI Agent James Spiropoulos, investigators accessed a Postal Service computer system that “incorporates a Mail Isolation Control and Tracking (MICT) program which photographs and captures an image of every mail piece that is processed.” Agents were able to obtain front and back images of about 20 mail pieces that had been processed “immediately before the mail piece addressed to Mayor Bloomberg.”
http://www.thesmokinggun.com/documents/woman-arrested-for-obama-bloomberg-ricin-letters-687435