TEXARKANA (CBSDFW.COM/AP) — An east Texas woman accused of sending ricin-laced letters to President Barack Obama and New York Mayor Michael Bloomberg in an attempt to frame her husband will undergo a psychological evaluation.

U.S. Magistrate Judge Caroline Craven on Thursday ordered that Shannon Richardson undergo the exam after her court-appointed attorney, Tonda Curry, requested it. Curry said in a court motion that she had observed “a pattern of behavior” that made her wonder if Richardson can assist with her defense.

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New Boston resident Richardson has been jailed without bond since her arrest June 7 on a charge of mailing a threatening communication to the president. The letters were postmarked May 20 in Shreveport, Louisiana.

The government alleges Richardson was trying to pin the crime on her estranged husband.

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Richardson did not speak at Thursday’s hearing. She appeared in an orange jumpsuit with her hands shackled.

If convicted, Shannon Richardson faces a maximum penalty of five years in prison and a $250,000 fine.

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