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What law is she breaking? So far as I know, there is no law against wearing the niquab in France. She has been doing so for a number of years without being arrested.
Also, and correct me if I am wrong, but French citizens (just like Americans) have a "civic duty" to vote, but there is no law forcing them to do so. Otherwise, French authorities would need to arrest a number of Jehovah's Witnesses, who for religious reasons refuse to vote, as well as the rest of the 15% of eligible French voters who did not vote in the last elections.