Multiple sclerosis , or MS, is a disease that causes the immune system to attack the protective sheath that covers nerve fibers. Symptoms and severity of the disease vary from person to person . In some cases, patients lose the ability to walk.

There's no cure for MS, but one Colorado man living with the disease hopes his perseverance will help raise money for MS research.

By day, you'll find John Carrasco running. But at night, you'll find him working the graveyard shift at the Douglas County Jail.

CBS

"Every 30 minutes I'd walk through, check on every single person," Carrasco said, while demonstrating his typical patrol.

For 18 years, Carrasco has been a deputy for the Douglas County Sheriff's Office.

"It just gives me, like, a sense of purpose. And I like it. I think a lot of

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