Smart is the New Hampshire school aide convicted of convincing her teenage lover and his buddies to kill her husband in 1990 in Derry.
Smart had accused officials at New York's Bedford Hills Correctional Facility of unfairly putting her in lockdown after prison-cell pictures of her wearing a bra and panties were published in a tabloid in 2003.
U.S. District Judge Robert Sweet said Smart did not sufficiently prove that her rights had been violated.
Smart is serving life without parole. Her lawsuit alleged a friend of a prison guard sold the sexy pictures to the National Enquirer.
(Copyright 2006 by The Associated Press. All Rights Reserved)