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We consider the possibility of detecting spin precession in a magnetic fieldby nonequilibrium transport processes. We find that time reversal symmetryimposes strong constraints on the problem. Suppose the tunneling occursdirectly between systems at two different chemical potentials, rather thansequentially via a third system at an intermediate chemical potential. Then,unless the magnetic fields are extremely strong or spin polarized electrons areused, the periodic signal in the current results from beating together twodifferent precession frequencies, so that observing a signal near the Larmorfrequency in this case requires having some cluster with a $g$ factor close tozero.Comment: 4 pages, 1 figur

Spin-orbit scattering and time-reversal symmetry: Detection of a spin by tunneling