KANSAS CITY, Kan. (AP) — A pollster hired by Kansas Secretary of State Kris Kobach testified Monday that a survey of 500 adults he conducted found just one person who couldn't produce a document proving U.S. citizenship.

The Topeka Capital-Journal reported his testimony came on the seventh day of a federal bench trial challenging Kansas' proof-of-citizenship requirement.

Pollster Pat McFerron also acknowledged possible bias in his survey under questioning by an attorney for the American Civil Liberties Union.

U.S. District judge Julie Robinson allowed McFerron to testify, even though he was no...