A home health-care nurse whose time sheets showed he worked at two different locations for two different employers at the same time on 536 days is not qualified to serve as the named plaintiff in a class-action lawsuit alleging one of the employers stiffed its workers of overtime pay, a federal judge held Tuesday.In a written opinion, U.S. District Judge Ronald A. Guzman concluded Ryan Smith would not be an adequate representative of a class of clinicians — nurses, occupational therapists, physical therapists and …