What is the test for crediting as true in a disability claim?

the Commissioner not a federal court is the factfinder. See 42 U.S.C. 405(g) (findings of Commissioner are conclusive so long as substantial evidence supports them). While the statute prohibits a claimant's testimony concerning pain or other symptoms alone from establishing a disability, this appears to be exactly what the crediting-as-true rule would require. Cf. 42 U.S.C. 523(d)(5)(A) ("An individual's statement as to pain or other symptoms shall not alone be conclusive evidence of disability as defined in this section; there must be medical signs and findings ... which show the existence of a medical impairment ... which could reasonably be expected to produce the pain or other symptoms alleged and which, when considered with all evidence ... would lead to a conclusion that the individual is under a disability." (emphasis added)). The government notes that the general rule (subject to "rare" exceptions) "is to remand to the agency for additional investigation or explanation." INS v. Ventura, 537 U.S. 12, 16, 123 S.Ct. 353, 154 L.Ed.2d 272 (2002) (per curiam). We do not credit-as-true in only "rare" cases; according to the government, we took some factfinding responsibility away from the Commissioner in at least twenty-two cases during 2007 and 2008.