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We show that if the excitations which become gapless at a quantum criticalpoint also carry the electrical current, then a resistivity linear intemperature, as is observed in the copper-oxide high-temperaturesuperconductors, obtains only if the dynamical exponent, $z$, satisfies theunphysical constraint, $z<0$. At fault here is the universal scaling hypothesisthat, at a continuous phase transition, the only relevant length scale is thecorrelation length. Consequently, either the electrical current in the normalstate of the cuprates is carried by degrees of freedom which do not undergo aquantum phase transition, or quantum critical scenarios must forgo this basicscaling hypothesis and demand that more than a single correlation length scaleis necessary to model transport in the cuprates.Comment: 4 pages, 1 .eps figure. Physical Review Letters, in pres

Breakdown of One-Parameter Scaling in Quantum Critical Scenarios for High-Temperature Copper-Oxide Superconductors