The man charged with abducting Elizabeth Smart understands the accusations against him but isn't competent to stand trial, a forensic psychologist said Wednesday.

Dr. Richart DeMier of the U.S. Medical Center for Federal Prisoners in Springfield, Mo., said Brian David Mitchell is not making rational decisions about his criminal defense.

"If he believes he's going to be miraculously delivered from prison by God in two years time, that's not a rational thought process," DeMier said during a competency hearing for Mitchell in U.S. District Court.

DeMier determined Mitchell suffered from paranoid schizophrenia after evaluating him over 45 days a year ago.

Mitchell participated in less than five hours of formal interviews and talked at length about his religious beliefs but shut down when DeMier raised issues related to his mental competency, the psychologist said.

Mitchell also directed staff at the Missouri hospital to refer to him by his religious name, Immanuel David Isaiah, the prophet, DeMier said.

Mitchell, 56, has been indicted on federal charges of kidnapping and unlawful transportation of a minor across state lines.

Federal prosecutors contend Mitchell is competent, and based on the findings of a New York forensic psychiatrist is faking or exaggerating symptoms of mental illness to avoid prosecution.

Mitchell's federal public defenders claim he is unable to assist them with his case.

In a state case, Mitchell, a former itinerant street preacher, was diagnosed with a delusional disorder and twice deemed incompetent for trial. A state judge also ruled that Mitchell was not a good candidate for forced treatment, effectively stalling the state proceedings.

U.S. District Judge Dale Kimball will ultimately decide if Mitchell can proceed to trial in the federal system. A ruling is not immediately expected when the hearing ends.

DeMier said Mitchell understands the charges against him, the court process and the roles of the judge, prosecutors and defense attorneys.

"He has the nuts and bolts of competency," DeMier said.

Earlier in the day, Dr. Paul Whitehead, a Utah State Hospital psychologist, said the treatment team that cared for Mitchell believed he was close to being found competent for state proceedings in 2005.

Mitchell's refusal to cooperate with an evaluator, however, ultimately forced the hospital to say it was impossible to make a determination about his competency, Whitehead conceded.

Whitehead said that as Mitchell's treating physician, he had no official opinion about Mitchell's competency.