Ms Bonvoisin puts it down to the fact that families were granted a long period of dialogue the first year.
But the key is France is a fiercely secular society; a strict separation of church and state underpinned the French Revolution and is one of the core values of the Republic. So, despite demonstrations by Muslims (left), the law had huge support with three-quarters of teachers and two-thirds of the public behind it.
Current events also played into the government's hands. In August 2004, just before the new law kicked in, Iraqis kidnapped two French journalists and demanded France repeal its headscarf ban. There was national outrage which was shared within the French Muslim community.
But maybe the most overwhelming factor was that the girls themselves, however determined to keep their veils, were finally not willing to be expelled over the issue. 