CBS News reported a new study suggesting Ambien could be contributing to traffic accidents. Tests on blood samples of 2,300 impaired drivers in the state of Wisconsin showed that in 53 of the most extreme cases of strange driving behavior, Ambien was found in the blood. According to the forensic toxicologist examining the samples, Ambien’s presence in the blood shows Ambien had been taken in excess, or that the users were not taking Ambien before sleeping at least 7 or 8 hours. The manufacturer of Ambien, Sanofi Aventis, has responded to similar reports in the media by stating that Ambien is safe and effective when taken as prescribed.