tests or devices

any requirement that a person as a prerequisite for voting or registration for voting (1) demonstrate the ability to read, write, understand, or interpret any matter, (2) demonstrate any educational achievement or his knowledge of any particular subject, (3) possess good moral character, or (4) prove his qualifications by the voucher of registered voters or members of any other class.

Defined by the Supreme Court in Presley v. Etowah County Commission Mack III, 502 U.S. 491 (1992).