Let OMEGA denote a smooth domain in R(n) containing the closure of a convex polyhedron D. Set chi(D) equal to the characteristic function of D. We find a flux g so that if u is the nonconstant solution of div ((1 + chi(D))delu) = 0 in OMEGA with partial derivative u/partial derivative n = g on partial derivative OMEGA, then D is uniquely determined by the Cauchy data g and f = u/partial derivative OMEGA.