  This paper corrects an earlier work suggesting that the quantum expectation
value of the proper length is bounded from below by the Planck length. The
original calculation examined fluctuations of the conformal factor of
Einstein-Hilbert gravity. However, in Einstein-Hilbert gravity, the conformal
factor is not a dynamical field subject to fluctuations. This paper performs
the same calculation using the trace anomaly-induced effective action for the
conformal factor and finds that, while conformal fluctuations modify the
short-distance behavior of the interval, the interval still approaches zero in
the coincidence limit.
