  We collected a sample of 661 confirmed and 361 possible BL Lac candidates
from the recent catalog of BL Lac objects (Veron-Cetty & Veron 2006). We
searched these sources in the recent data release DR5 of the Sloan Digital Sky
Survey (SDSS) and found spectra were available for 169 and 109 confirmed and
possible BL Lac candidates respectively. We found 32 candidates from confirmed
and 19 candidates from possible BL Lac lists have non featureless spectra and
are thus possibly not BL Lac candidates. We report here the preliminary results
from our analysis of a sample of 278 BL Lac objects.
