The credibility of individuals with personality disorders has been questioned at least since the 1960s.

He said in an interview that he had not been questioned since 2003.

He has also questioned the usefulness of further privatizations, a keystone of government policy since 1988.

Rickler had been questioned by prosecutor since March 2012.

Reviewers have questioned the character's sexuality since the end of the series.

The validity of the Heckscher-Ohlin model has been questioned since the classical Leontief paradox.

The safety of genetically modified foods and ingredients has often been questioned, particularly since the wide-scale discussion and protests in the early 2000s.

The purpose of continuing the Europe program has been questioned since the end of the cold war.

However, de Couto's claim that he tortured Christians was questioned, since no other source reported this, and has been described as lacking credibility.

"Who owns the entities has been questioned by his investment bankers since the early 1990's," Mr. Luken said.