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An answer is a proof of a bound on the transport scattering rate within a defined class of models, or a material with reliably measured $\\alpha$ well above 1.","problem_ref":"d887532c1f6edd1e8747472a7d74fa9c48c33c7fed4ce231740d5f992602181a","references":"","settled_by":"Quantum-oscillation or specific-heat masses combined with resistivity slopes in many materials, plus a theorem bounding $\\hbar/\\tau$ in a stated class of models.","status_note":"Analyses of several hole-doped cuprates (2019) gave $\\alpha \\sim 1$; no rigorous bound on the transport rate is known.","title":"Is the Planckian scattering rate universal, and is it a 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