  The absence of fixed momentum excitations in a theory with Lifshitz scale
invariance gives rise to exponential suppression of spectral weight in the
low-frequency limit. In the holographic dual, this suppression arises as a
consequence of a tunneling barrier that decouples the horizon from the
boundary. We compute the spin-1/2 holographic Green's function and show that
the form of the barrier is identical to that of the scalar case. We furthermore
demonstrate that the suppression factor is universal in the $\hat\omega\to0$
limit where $\hat\omega=\omega/|\vec k|^z$. In particular, it depends only on
$\hat\omega$ and the critical exponent $z$, and is independent of scaling
dimension and spin.
