WYOMING COURT RULES

142 Jahnke v. State, 692 P.2d 911, 1984 Wyo. LEXIS 351 (Wyo. 1984). For Supreme Court to invoke plain error rule, three specific criteria must be fulfilled: (1) the record must be clear as to the incident that occurred at trial that is alleged as error; (2) the proponent of the rule must demonstrate a vio- lation of a clear and unequivocal rule of law; and (3) the proponent must prove that a sub- stantial right has been violated and that the defendant has been materially prejudiced by that violation. Madrid v. State, 592 P.2d 709, 1979 Wyo. LEXIS 508 (Wyo. 1979); Ketcham v. State, 618 P.2d 1356, 1980 Wyo. LEXIS 320 (Wyo. 1980); Settle v. State, 619 P.2d 387, 1980 Wyo. LEXIS 319 (Wyo. 1980); Bradley v. State, 635 P.2d 1161, 1981 Wyo. LEXIS 391 (Wyo. 1981); Marshall v. State, 646 P.2d 795, 1982 Wyo. LEXIS 346 (Wyo. 1982); Britton v. State, 643 P.2d 935, 1982 Wyo. LEXIS 332 (Wyo. 1982); Westmark v. State, 693 P.2d 220, 1984 Wyo. LEXIS 354 (Wyo. 1984), limited, Summers v. State, 725 P.2d 1033, 1986 Wyo. LEXIS 614 (Wyo. 1986). Guiding criteria when an appellant seeks review under the plain-error concept are: (1)