  We report on the first ever detection of circular polarization in molecular
lines forming in magnetic regions on the surfaces of active stars. The new
observations were obtained with the high-resolution spectropolarimeter ESPaDOnS
recently installed at the Canada-France-Hawaii Telescope. In July 2005 we
carried out a survey of 17 G-K-M stars including active main-sequence dwarfs
and RS CVn-type giants and subgiants. All stars were found to possess surface
magnetic fields producing average atomic Stokes V signals of 0.05% to 0.5%.
Three stars clearly showed circular polarization in molecular lines of 0.5% to
1%. The molecular Stokes V signal is reminiscent of that observed in sunspots.
