  We analyze the breakdown of causality for the perfect fluid limit in a medium
with polarizeability. We show that to restore causality a relaxation term
linking vorticity and polarization, analogous to the Israel-Stewart term
linking viscous forces and gradients,is required. This term provides a minimum
amount of dissipation a locally thermalized relativistic medium with
polarizeability must have, independently of its underlying degrees of freedom.
For ferromagnetic materials an infrared acausal mode remains, which we
interpret as a Banks-Casher mode signaling spontaneous magnetization. With
these ingredients, we propose a candidate for a fully causal Lagrangian of a
relativistic polarizeable system near the perfect fluid limit.
