Frankie Dettori's positive test at Longchamp 'not performance-related' admits jockey's solicitor "There are a large variety of substances which are banned by France Galop," Dettori's solicitor, Christopher Stewart-Moore, told the BBC. Dettori would not be the first high-profile jockey to fall foul of the French authority. Kieren Fallon was banned for six months by France Galop in 2006 after returning a positive test for a metabolite of a banned substance. France Galop then banned him for a further 18 months after a second positive test in August 2007. Indeed, Dettori himself was cautioned by police for possession of cocaine in 1993.