  EPR-steering refers to the ability of one observer to convince a distant
observer that they share entanglement by making local measurements. Determining
which states allow a demonstration of EPR-steering remains an open problem in
general. Here, we outline and demonstrate a method of analytically constructing
new classes of two-qubit states which are non-steerable by arbitrary projective
measurements, from consideration of local operations performed by the steering
party on states known to be non-steerable.
