IT ALL began with the best, if exceedingly ambitious, of intentions – to develop a machine that by a simple pinprick on a patient’s finger could detect any disease known to man. But it ended in the most tragic of circumstances, with the firm behind the invention crashing and a British scientist who had devoted himself to the project taking his own life. Now his widow has spoken out about the treatment he suffered before and after his death at the age of 67, accusing his employers of heartlessness.