  It is shown that a non-relativistic Fermi particle with a non-zero rest
energy moving in a pseudoscalar ${\delta}$-function potential in one dimension
can be confined for both signs of the coupling constant. The binding energies
depend on the value of the particle's rest energy, and in the limit of
vanishing rest energy only one of the bound states survives. The coefficients
of reflection and transmission are determined, and the conditions for complete
reflection and transmission are discussed.
