  We searched the Milky Way Plane along a 6-deg swath for pulses of
monochromatic light as faint as 15th mag (V band) using a wide-field telescope
equipped with a prism. Pulses with duration less than 1 second that occur more
often than once every 10 minutes would be detected, and pulses arriving less
frequently would be detected with proportionally lower probability. No
unexplainable monochromatic emission, pulsed or continuous, was detected. The
detection threshold corresponds to a 70 GW laser having a diffraction-limited
10-meter aperture located 1 kiloparsec away (depending on wavelength). Previous
searches for laser emission from more than 5000 stars found none. Previous
all-sky surveys at optical and radio wavelengths have revealed thousands of
unexpected objects in the universe that exhibited extraordinary spectral
emission, but none were technological. Hypotheses of our Milky Way Galaxy
teeming with advanced life must be demoted.
