It is currently legal to possess ghost guns in Arizona. The Biden Administration has indicated that it is trying to curb ghost guns, which are guns made out of various parts and without a serial number. It is possible that federal law may soon require background checks to purchase ghost guns or that separate gun parts contain serial numbers. In response on April 6, 2021, Arizona Governor Doug Ducey signed House Bill 2111 to make Arizona a Second Amendment sanctuary. HB2111 prevents Arizona state and local law enforcement agencies from enforcing federal gun control laws inconsistent with state laws. So if federal measures restricting ghost guns go into effect, Arizona police officers will not be enforcing it. Maricopa County Sheriff Paul Penzone opposed the bill.