OFFENSIVE LETTERS Length of case

Time line in investigation of threatening letters that federal authorities say were sent by a Pepper Pike, Ohio, man:

1980s: Letters begin.

Early 1990s: Letters appear to stop.

Late 1990s: Letters resume.

July 2003: Letter sent to U.S. Supreme Court Justice Clarence Thomas.

March 14: David Tuason, 46, arrested.

Source: Federal authorities and indictment