What the Hell is a supply teacher, anyway?In an incident that perhaps gives a new meaning to the phrase 'supply teacher', a 59-year-old substitute teacher has been arrested on suspicion of repeatedly taking cocaine in front of the class she was teaching.The arrest came after two girls? one nine, the other ten? reported that Joan Donatelli had been dipping a pen cap into a small plastic bag filled with white powder, then putting the pen lid to her nose.Police subsequently found traces of...