This entire audit by Senate Republicans is uncharted territory for Arizona. An audit commissioned by a Senate president is a first. This is so unprecedented that there is nothing in state law or the Elections Procedures Manual that envisions the tabulation equipment leaving the custody of the county's Elections Department, according to Megan Gilbertson, spokeswoman for the Maricopa County elections department. Hobbs contends that the break in the chain of custody -- when the county shipped its elections machines to the Senate's audit site at Veterans Memorial Coliseum -- raises serious concerns. Chain of custody is a critical piece of elections procedure, ensuring there's no tampering with ballots or equipment. Custody of election materials is tracked very step of the way.