Sic Semper Tyrannis
Alex and Emily were taken to the hospital shortly after the deadly chase, which resulted in numerous deaths and extensive property damage. With the other suspects dead, having been riddled full of dozens of bullets, Alex was the only person left who the police could interrogate. Well, he and Emily, thus, as he received treatment for his bullet wound. The police tried their best to get him to talk.
It was not just the local police who were interrogating Alex, but rather the feds had been called in after it was confirmed that machine guns were used in the car chase. And though the ATF had found the submachine guns wielded by the hitmen, they found no trace of the weapon Alex had used to riddle them full of bullets.