TUPELO (AP) — The ex-wife of a man accused of mailing a poison-laced letter to the president says she and all of his family and friends are sure he is innocent. Laura Curtis of Booneville said she gave the FBI the names of people she thinks might have tried to frame him.

Curtis spoke out Saturday for 45-year-old Paul Kevin Curtis, who is accused of sending letters containing powdered ricin to President Obama and Sen. Roger Wicker of Tupelo.

The letters in question were signed “I am KC and I approve this message,” a phrase Curtis often used in writing about an alleged conspiracy. They also said: “To see a wrong and not expose it, is to become a silent partner to its continuance,” a quotation on Curtis’ public Facebook profile.

That doesn’t prove anything, Laura Curtis said: “Anybody could get his tagline.”

She said the FBI has been easy to work with and she believes investigators will find whoever sent the letters.

A hearing for Kevin Curtis began Friday and will continue Monday. He was arrested Wednesday on federal charges of intentionally mailing threats to the officials.

He has denied the allegation through attorney Christi R. McCoy.

Friday’s only witness, FBI Special Agent Brandon Grant, testified that investigators did not find Curtis’ fingerprints on any of the letters. The agency is awaiting test results from evidence collected at Curtis’ home.

Grant also said Laura Curtis had told investigators that Kevin Curtis suffers from bipolar disorder and had been extremely violent toward her.

Laura Curtis did not dispute the accuracy of Grant’s testimony but said “only one percent of the truth came out.”