  This paper reports new, more sensitive observations of nine of the eleven
extrastatistical signals in the Megachannel Extraterrestrial Assay (META).
These extrastatistical signals had all of the expected characteristics of a
transmission from an extraterrestrial transmitter, except that they did not
repeat. Cordes, Lazio, & Sagan showed that this lack of repeatability could be
explained by the high detection thresholds used in the reobservations of these
candidates combined with interstellar scintillation of intrinsically steady
sources. We use the Cordes, Lazio, & Sagan methodology, correcting an error in
the original presentation, and our new observations to rule out this
scintillation hypothesis at a confidence level of at least 97.8% (for the case
of an intrinsically weak source) to a level in excess of 99% (if the source
strengths are comparable to that favored by Cordes, Lazio, & Sagan. We also
demonstrate that gravitational microlensing cannot account for the initial
detection of these candidate signals nor is gravitational lensing likely to
play a role in future SETI programs. We conclude that the META candidates do
not reflect a large population of powerful, strong beacons.
