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Determine for each material whether the measured negative magnetoresistance follows this scaling once current jetting and inhomogeneity are excluded. An answer is a material-by-material verdict with $\\tau_v$ measured independently.","problem_ref":"e3b4723b110de842ca62e4b6464074e3a62a731d2edeb4469cca1e9fd49bc445","references":"","settled_by":"Multi-contact potential mapping that excludes current jetting, with $C_a$ measured versus $\\mu$ across gated or doped samples and compared with independently measured $\\tau_v$.","status_note":"","title":"Is negative longitudinal magnetoresistance a chiral-anomaly 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