Two mothers tipped police to drugs in their sons' bedrooms, leading to the arrest of one of the teen-agers and confiscation of cocaine from both, police said. The recent arrest of a 14-year-old Landover boy came after his mother told police that she had found the drug in the youth's room, said Carol Landrum, a spokesman for the police department. The son was charged with possession of a controlled dangerous substance with intent to distribute and was being held at Boys Village in Cheltenham, Landrum said. Police said they seized 19 grams of cocaine, which officers said could sell for $4,700 if divided into smaller amounts. Only one day earlier, another Landover woman told police she found nearly seven ounces of cocaine, with a street value police placed at about $47,000, under her son's bed and a handgun in his dresser drawer. Police did not immediately make an arrest in that case, Landrum said. Police declined to identify either woman. Police Chief Robert Zidek in neighboring Bladensburg, whose department offers parents a videotape showing how to search for drugs, said the mothers probably did the right thing to help their sons. ``They may have tried everything else, and nothing worked,'' Zidek said. He advises parents who think their child is using drugs to talk to the child first, get the child professional counseling and save calling the police as a last resort.