  We study whether the probability distribution of a discrete quantum walk can
get arbitrarily close to uniform, given that the walk starts with a uniform
superposition of the outgoing arcs of some vertex. We establish a
characterization of this phenomenon on regular non-bipartite graphs in terms of
their adjacency eigenvalues and eigenprojections. Using theory from association
schemes, we show this phenomenon happens on a strongly regular graph $X$ if and
only if $X$ or $\overline{X}$ has parameters $(4m^2, 2m^2\pm m, m^2\pm m,
m^2\pm m)$ where $m\ge 2$.
