we asked euthanasia commission co-chair gilles genicot about that number. >> i can understand it might sound surprising, but the way our law works is based on trust we give to doctors. because they know their patients far better than anyone else. >> reporter: genicot says he thinks doctors acted appropriately in the case of tom mortier's mother, and that mortier's complaint to the european court has no legal standing. but there have been other controversial cases that have raised eyebrows, including: a transgender patient who was euthanized because of depression following an unsuccessful sex change operation; and twins who were chronically ill, deaf and going blind who were euthanized together. >> those cases are really extremely rare, so we can mention them, it's okay to discuss them, but we should not bring them to the front to say... to put the law into question because the law is not primarily made for these cases. >> reporter: in fact, dr. marc van hoey says only about 5% of his cases were psychiatric patients. but he doesn't shy away from discussing them. as he sees it, euthanasi