. >> reporter: after he got some water from pima county sheriff's deputy karl woolridge, we learned that 24-year-old jesus gonsalez had been wandering for four days after crossing the border from mexico 60 miles away. is this unusual? >> not at all. >> reporter: now the department of homeland security would like local officers like deputy woolridge to voluntarily tyke a new role so they can act as immigration officers. if you had to put those people in your jails, would there be enough room? >> no, we're right there at capacity. we don't have the manpower to really get into immigration enforcement. >> reporter: even though jesus may have broken a federal law-- >> that's not a problem for a local sheriff. my responsibility is public safety in this county. that's my responsibility. >> reporter: pima county's newly elected republican sheriff mark napier has 500 sworn officers who protect roughly 1 million residents across 9,000 square miles along want southern border. if your deputies are viewed as immigration enforcers, how does that impact their ability to do their job? >> we wouldn't get

after he got some water from pima county sheriff's deputy karl woolridge, we learn that jesus gonzalezveral days near the border 60 miles away. is this unusual? >> not at all. >> reporter: now the department of homeland security would like local officers like deputy woolridge take on a new role so they can act as immigration officers. if you had to put those people in your jails, would there be enough room? >> no, we are right at capacity. we don't have the panpowero enforce. >> reporter: even if jesus broke a federal law -- >> my responsibility is public safety in this county. that's my responsibility. >> reporter: pima county's newly-elected sheriff mark napier has 500 sworn officers who protect roughly a million residents across 9,000 square miles along the southern border. if your deputies are viewed as immigration enforcers, how does that impact their ability to do their job? >> we wouldn't get a lot of the calls that we get. i mean, where people witness crimes or victims of crime out of fear to lead to deportation. >> reporter: so deputy woolridge didn't detain jesus. instead, he

of the arizona desert, and water was the first thing he pleaded for when he spotted deputy carl woolridgen command of the peopma county sheriff's department. >> what's the story here. >> undocumented alien. >> reporter: the 24-year-old said he left his wife and young child in mexico before crossing the border on monday to look for work in the u.s. he admitted it's at least the second time he's entered the country illegally. >> no water for four days. >> reporter: he walked 60 miles before flagging down deputy woolridge. >> is this unusual? >> not at all. >> reporter: even though jesus is suspected of breaking federal law, it's not something the deputy with enforce. >> that's not a problem for a local sheriff. my responsibility is public safety in this county. that's my responsibility. >> reporter: the department of homeland security is now asking local law enforcement to go a step further, by voluntarily acting as an immigration officer for purposes of enforcing federal immigration law. >> we have our plate full. our jail is nearly full, and i don't have excess deputy. >> reporter: the sh

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