Police in Paris arrested a man in an underground car park in connection with a series of shooting in the city earlier in the week.
The man was held in a car park in the suburb of Bois-Colombes.
More top news
The decision represents something of a victory for the president who will now be able to enforce most of his controversial 90-day ban.
Cool in the north, warmer air to the south
Police have warned the drug, known locally as "pink champagne", could be deadly.