The following excerpt is from Clegg v. Callahan, 119 F.3d 5 (9th Cir. 1997):
If a claimant shows that he or she cannot return to his or her previous job, the burden of proof shifts to the [Commissioner] to show that the claimant can do other kinds of work. Without other reliable evidence of a claimant's ability to perform specific jobs, the [Commissioner] must use a vocational expert to meet that burden.
Matthews v. Shalala, 10 F.3d 678, 681 (9th Cir.1993) (citation omitted).
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