Altamirano v. Industrial Commission

It is axiomatic that petitioner has the burden of establishing his claimed disability. Where such disability cannot be seen or known by laymen, it can only be established by expert medical testimony. Riggins v. Industrial Commission, 9 Ariz. App. 469, 453 P.2d 980 (1969); Montgomery v. Industrial Commission, 7 Ariz. App. 109, 436 P.2d 621 (1968).