  We investigate the rate of false planetary transit detection due to blending
with eclipsing binaries. Our approach is purely empirical and is based on the
analysis of the artificially blended light curves of the eclipsing binary stars
in the Large Magellanic Cloud from the archive of the Optical Gravitational
Lensing Experiment (OGLE). Employing parameters that characterize the
significance of the transit and the amplitude of the variation out of the
transit, we can substantially limit the number of potential false positives.
Further constraint comes from the expected length of the transit by a possible
planetary companion. By the application of these criteria we are left only with
18 candidates from the full sample of 2495 stars. Visual inspection of these
remaining variables eliminates all of them for obvious reasons (e.g., for
visible fingerprints of orbital eccentricity). We draw the attention to the
short-period stars, where the false alarm rate is especially low.
