Authorities as the decision cited them, with how this panel applied each one.
Garza v. WCAB (1970) 3 Cal.3d 312; Sheffield Medical Group v. WCAB (Perez) (1999) 70 Cal.App.4th 868
WCJ credibility determinations entitled to great weight
WCJ's credibility finding regarding applicant's testimony accepted
From the decision · page 9It is well established that a WCJ’s opinions regarding witness credibility are entitled to great weight. ( Garza v. Workmen’s Comp. Appeals Bd. (1970) 3 Cal.3d 312, 319 [35 Cal.Comp.Cases 500, 505]; Sheffield Medical Group v. Workers’ Comp. Appeals Bd.
Lab. Code, § 5952(d); Lamb v. WCAB (1974) 11 Cal.3d 274; Garza v. WCAB (1970) 3 Cal.3d 312
Substantial evidence requirement for Appeals Board decisions
Applied to evaluate whether medical evidence supports findings on injury AOE/COE
From the decision · page 6It is well established that an award, order, or decision of the Appeals Board must be supported by substantial evidence. (Lab. Code, § 5952(d); Lamb v. Workmen’s Comp. Appeals Bd. (1974) 11 Cal.3d 274, 281 [39 Cal.Comp.Cases 310]; Garza v. Workmen’s Comp. Appeals Bd. (1970) 3 Cal.3d 312, 317 [35 Cal.Comp.Cases 500].)
Lab. Code, § 3208.3(b)
Psychiatric injury compensability requires actual events of employment predominant as to all causes combined
Applied to QME Lopez's opinion that termination was predominant cause
From the decision · page 7A psychiatric evaluator must first determine the threshold issue of whether an injured worker sustained a psychiatric injury. Once a psychiatric injury has been found, the doctor must then address the issue of whether actual events of employment were the predominate (greater than 50%) cause of the psychiatric condition. (Lab.
Lab. Code, § 5701, 5906; Tyler v. WCAB (1997) 56 Cal.App.4th 389; McClune v. WCAB (1998) 62 Cal.App.4th 1117
Appeals Board authority to develop record when substantial evidence lacking on threshold issue
Record to be developed regarding headaches causation
From the decision · page 8The record as it now stands is not adequate to make a final determination as to the threshold issue of injury AOE/COE pertaining to applicant’s headaches. The Appeals Board has the discretionary authority to develop the record when the record does not contain substantial evidence pertaining to a threshold issue. (Lab. Code, § 5701, 5906; Tyler v.