  Arguments are reviewed in support of the hypothesis that ET would more likely
send physical probes to surveil our Solar System and communicate with Earth
than to communicate from afar with interstellar radio, infrared or laser
beacons. Although the standard SETI practice of targeting individual stars or
galaxies with powerful telescopes might detect a foreground local probe by
serendipity, an intentional hunt for those probes would entail a different set
of strategies, most notably sacrificing sensitivity (needed to detect a very
faint and very distant signal) in exchange for a widened field-of-view (because
a local signal can be reasonably hypothesized to be relatively bright). This
paper suggests a number of strategies to detect local ET probes.
