that's because a driver in a bmw realized he has a flat tire back on august 30th. he took his car to the dealership and that's when they found a bullet fragment in his tire. thanks to tire technology, they think his car could not have -- could have been shot as many as eight days before that. authorities also believe that three other shootings linked to merit's gun all happened on saturday august 29th. the case continues to play out in the court system, registration for concealed carry permits triple in some parts of phoen phoenix. authorities maintain there could continue to be copycats out there but also point out that to date there have been no additional shootings since he was arrested. >> will carr following the investigation as he did the shootings from los angeles. thanks, will. in a few hours the tr-- wha effect will the pope's visit