An Arizona Department of Public Safety spokesperson told ABC15 they handed over all the ballistic evidence from their 2015 investigation to help Phoenix police with the serial street shootings investigation.
Phoenix police have identified Aaron Saucedo as a person of interest in the serial street shootings.
Saucedo is currently in jail accused of a 2015 killing, but he is also being questioned with the shooting spree that happened between March and July 2016, which left 7 people dead.
Saucedo's gun was also part of the freeway shootings investigation back in 2015.
DPS says investigators confiscated eight guns and test fired all of them. However, when they analyzed the bullet fragments they stopped after they came upon what they thought was a match.
That process led to the arrest of suspected shooter Leslie Merritt Jr.
Sources tell ABC15 that Saucedo's gun was never analyzed, and went back to the pawn shop.
Months later, Phoenix police took possession of the gun and conducted their own testing, leading to Saucedo's arrest in connection with the 2015 murder.
The freeway shootings remain unsolved.
DPS tells ABC15 Saucedo is not a person of interest in the freeway shootings investigation.