Is a prospective juror who is unqualified for jury duty properly stricken for cause?

There is a fundamental "public[ ] interest in fair trials designed to end in just judgments," United States v. Jorn , 400 U.S. 470, 480, 91 S.Ct. 547, 27 L.Ed.2d 543 (1971) (plurality opinion) (internal quotation marks omitted), giving both society and the parties an interest in restricting jury service to persons who are competent to serve. A prospective juror who is unqualified is properly dismissed for cause. See , e.g. , United States v. Pineda , 743 F.3d 213, 217 (7th Cir. 2014) (a juror who "is unable to read, write, speak, and understand English may be appropriately stricken for cause"). A defendant's constitutional rights to be tried by a jury reflecting a cross-section of the community and by a jury from which persons have not been excluded by reason of race do not override the interest in restricting jury service to persons who are competent to serve.