Conserved currents and gauge invariance in Yang-Mills theory
  It is shown that in the absence of free abelian gauge fields, the conserved currents of (classical) Yang-Mills gauge models coupled to matter fields can be always redefined so as to be gauge invariant. This is a direct consequence of the general analysis of the Wess-Zumino consistency condition for Yang-Mills theory that we have provided recently. 
Glenn Barnich, Friedemann Brandt and Marc Henneaux