Gov. Snyder has vetoed gun legislation allowing concealed weapons in churches, schools, daycares .
Snyder said in a release Tuesday that public venues need clear legal authority to ban firearms "if they see fit to do so."
Snyder told The Associated Press Monday he was scrutinizing the bill after Friday's massacre at a Connecticut school. He also drew on memories of a fatal shooting in his college dormitory more than three decades ago.
The legislation would have prohibited openly carrying guns in those places while allowing permit holders to carry concealed weapons. But they couldn't do so if the locations declare themselves weapons-free zones.
Under existing law, people may openly carry guns in those and other locations but carrying concealed weapons on those premises is illegal.