Even if the guns themselves were identical and they were carrying the same type of bullets, they would still have differing markings on them.

They also had a ballistics expert in court.

Firearms examiner Srinivasan Rathinam, with the LAPD, said that 8.5 pounds are force are needed to shoot the semiautomatic 9mm luger caliber firearm that police found on the floorboard of the Black SUV the group was riding in the night of the incident.

"If you just tap the trigger, it won't fire," he said, adding that "you need to pull the trigger all the way down."

Rathinam also confirmed that the cartridge casings found at the scene of the shooting — four were found by police right after the incident, and one was found by a neighbor the following day — matched the gun found in the vehicle.

Rathinam added: "I'm not sure whether I can call this an accident."

Prosecutors told the court during opening statements that police found the gun was "warm" on a cool night and in "slide-lock position," indicating not only that the gun had recently been used, they said, but also that all of the rounds had been fired.

The gun was fired five times, prosecutors said, hitting Megan in several parts of her feet. Some remnants from the bullets remain inside her feet, a surgeon testified on Thursday.