LAFAYETTE, La. (AP) — A federal judge has agreed to delay the trial of a Lafayette private investigator accused of setting up a scheme to bribe 15th Judicial District Attorney's Office employees for favorable treatment for DWI defendants.

The Advocate reports  Robert Williamson was set to go to trial in March, but U.S. District Judge Elizabeth Foote delayed it to Aug. 18, citing concerns from Williamson's defense attorney about the volume of evidence that needs to be reviewed in the case.

Foote already had granted a prior delay in the case, moving the trial from its original date in December until March to give Williamson time to seek medical care.

Five people, including three former employees of the District Attorney's Office, already have pleaded guilty in a federal probe of the bribes.