Shannon Rogers Guess Richardson called law enforcement after finding the substance, suspected of being ricin. The couple's home is in New Boston,
about 25 miles west of Texarkana.
Sources say Shannon Richardson is pregnant. The couple wed on Oct. 9, 2011, according to Bowie County records.
Nathaniel Richardson, who works at Red River Army Depot, was been detained by federal officials Thursday but it is unclear Friday morning where he is being held.