CROWN HEIGHTS - Officials in Crown Heights say store owners should keep a watchful eye out for counterfeit bills circulating in the area. Members of the Shomrim Patrol, a Jewish volunteer safety force, tell News 12 Brooklyn that several incidents involving fake $100, $50 and $20 bills have taken place along Kingston Avenue since July. One business owner says an alleged counterfeiter tried to buy a box of cereal with a $100 bill. "The cashier knew right then and there," says supermarket owner Kol Tov. "And the person that brought it to him was afraid. He walked out of the store and ripped it up right over there." Another owner says fake money can be identified by its shadow, raised letters and a vertical line streaked across the bill.