There was a case here where a driver (with a car full of people) killed a dude on a motorcycle late one night. Originally, the driver was supposed to have be the DD for her intoxicated boyfriend. It turns out, he was behind the one behind the wheel (drunk, of course), and everyone in the car agreed to say the the girlfriend was driving. NYPD pulled the text messages between them, plus surveillance footage from the bars they had been at just before the accident to prove he had been drinking all night. If there's anything remotely like that here, LAPD will do the same.