Pima County Sheriff Clarence Dupnik said his deputies will continue to call the Border Patrol to determine a person's immigration status if a deputy suspects that person is in the country illegally.

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It's important to remember that a person's health status is affected by more than just personal behaviors.

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And unlike other characteristics that employers are generally banned from considering, such as an applicant's race, religion or gender, "the circumstances surrounding a person's unemployment status may, in certain situations, be relevant to employers when selecting qualified employees, " he said.

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Among examples of New York City's strategies are the executive orders Mayor Michael Bloomberg signed in 2003 that keep city employees from inquiring about a person's immigration status unless required.

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Under the new procedures, border agents will verify a student's visa status before the person arrives in the US, using information provided in flight manifests.

BBC: US tightens student visa rules after Boston bombing

Isolation, loneliness and low social status can harm a person's subjective sense of well-being, as well as his or her intellectual achievement, immune function and health.

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Beforehand, border agents would only verify a student's status in a database, the Student and Exchange Visitor Information System, when the person was referred to a second officer for additional inspection or questioning.

BBC: US tightens student visa rules after Boston bombing