  In this work we analyse a non-minimal Lorentz-violating extension of the
electroweak theory in the fermionic sector. Firstly we analyse the relation
between the CKM rotation in the quark sector and possible contributions of this
new coupling to flavour changing neutral currents (FCNC) processes. In sequel
we look for non-diagonal terms through possible leptonic flavour violation
(LFV) decays. Strong bounds are presented to the Lorentz violating parameters
of both the quark and the leptonic sectors.
