Junnosuke Taguchi, a former member of Japanese all-male idol group KAT-TUN, has admitted since his recent arrest that he used marijuana, investigative sources said Thursday.Taguchi, 33, was taken into custody Wednesday with his partner Rena Komine, 38, a former actress, for allegedly having a few grams of marijuana at the Tokyo apartment they share.Taguchi told investigators the marijuana belongs to both of them while Komine said it was hers alone. The two are expected to be sent to prosecutors on Friday, according to the sources.Related coverage:READ FULL ARTICLE