An Oakland man who says he was strip-searched in an Alameda County jail after a drunken-driving arrest has filed a federal class-action suit accusing the county of conducting the searches without evidence that detainees are hiding weapons or contraband.

Ron Charles Roth, 47, filed suit two months after a judge gave final approval to a $6.2 million settlement of a similar federal class-action suit claiming that Alameda County authorities had conducted illegal strip searches at two jails from 2004 to 2006.

A California Highway Patrol officer arrested Roth in front of his home Feb. 3, 2007, for allegedly being under the influence when he moved his car…

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