YG Entertainment has just released an official statement about their position regarding the issues surrounding G-Dragon's marijuana case. In the documents released to the press, YG Entertainment stated,

We would like to sincerely offer our deepest apologies to all the fans and to everyone who appreciates Big Bang's music. G-Dragon underwent an investigation for smoking marijuana last July. Because G-Dragon had never smoked marijuana, we cooperated with the investigation confidently and proceeded as usual with scheduled events. However, according to the hair strand test, G-Dragon tested positive for minuscule amounts of marijuana, which shocked us. While we were contemplating what the reason could be, we thought of the event that occurred in May during their Japan tour. There was a drinking event to celebrate a successful concert with various Japanese associates who visited us at the concert location. When G-Dragon went to use the restroom, a young person who seemed to be a Japanese fan recognized G-Dragon and offered him a cigarette as he greeted him. Out of courtesy, G-Dragon took two or three puffs, but upon feeling that it was different from normal cigarettes, he flushed it down the toilet right away. We thought it to be a trivial event, and soon we were unable to remember that it ever happened. However, when we began to ponder over the reason for this positive test, that night's event returned as the likely cause.  We contacted the prosecution right away and related the event exactly as it happened. Although there was no legal penalty issued, the guilty conscience and responsibility for causing everyone pain is a weight that G-Dragon and the company must now carry upon our shoulders, and it is heavier than any penalty. As celebrities who have received a lot of interest from the public, and as a company who is supposed to thoroughly manage them, we sincerely regret the emergence of this situation, and have been self-reflecting on our carelessness. We deeply bow our heads as we apologize for causing you to worry once again, and we will try our best to make sure this type of event does not occur again.