  We study the effects of a barely perceivable violation of Lorentz invariance
on results computed using a relativistic constituent quark model wave function.
The model nucleon wave function of Gross {\it et al.} is constructed such
thatthere is no orbital angular momentum and that the spin-dependent density is
spherical. This model wave function is claimed to be manifestly covariant, but
we show that this is not so. In particular,the seeming covariance of the matrix
elements of the electromagnetic current arises from using the Breit frame.
Matrix elements have a different appearance in any other frame.
