The Food and Drug Administration is studying 25 sudden deaths of people taking Ritalin. David Rosenberg, professor of child psychiatry and psychology at the Wayne State University School of Medicine and Children's Hospital, called the drugs some of the safest in medicine. Still he's happy the news will call attention to the need for a precise diagnosis and proper evaluation of a person before drugs are prescribed. "Not every child who is hyperactive or who is bored in class" has an attention deficit problem he said.