Published: 2005
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The usage of polarimetry and spin-correlation tests to determine the complete Lorenz structure of the tau lepton's charged and neutral- current couplings is reviewed. The emphasis is on tests for ''something'' in a (V-A)+ ''something'' structure in J[sup charged] Lepton current, so as to bound the scales [lambda] for ''new physics'' such as arising from tau weak magnetism, weak electricity, and/or second-class currents. Tests for T and for CP violation are discussed.