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We analyse the quantum backflow effect and extend it, as a limitingconstraint to its spatial extent, for scattering situations in the presence ofa purely transmitting discontinuous jump-defect. Analytical and numericalcomparisons are made with a different situation in which a defect isrepresented by a $\delta$ function potential. Furthermore, we make the analysiscompatible with conservation laws.

Quantum backflow in the presence of a purely transmitting defect