  We present an automated statistical method that uses medium-resolution
spectroscopic observations of a set of stars to select those that show evidence
of possessing significant amounts of neutron-capture elements. Our tool was
tested against a sample of $\sim 70,000$ F- and G-type stars distributed among
$215$ plates from the Galactic Understanding and Exploration (SEGUE) survey,
including $13$ that were directed at stellar Galaxy clusters. Focusing on five
spectral lines of europium in the visible window, our procedure ranked the
stars by their likelihood of having enhanced content of this atomic species and
identifies the objects that exhibit signs of being rich in neutron-capture
elements as those scoring in the upper $2.5\%$. We find that several of the
cluster plates contain relatively large numbers of stars with significant
absorption around at least three of the five selected lines. The most prominent
is the globular cluster M3, where we measured a fraction of stars that are
potentially rich in heavy nuclides, representing at least $15\%$.
