Why was Tony Stewart allowed to race?

Caption:WATKINS GLEN, NY - AUGUST 08: Tony Stewart, driver of the #14 Rush Truck Centers/Mobil 1 Chevrolet, sits in his car during practice for the NASCAR Sprint Cup Series Cheez-It 355 at Watkins Glen International on August 8, 2014 in Watkins Glen, New York. (Photo by Jerry Markland/Getty Images)
Caption:WATKINS GLEN, NY - AUGUST 08: Tony Stewart, driver of the #14 Rush Truck Centers/Mobil 1 Chevrolet, sits in his car during practice for the NASCAR Sprint Cup Series Cheez-It 355 at Watkins Glen International on August 8, 2014 in Watkins Glen, New York. (Photo by Jerry Markland/Getty Images)

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    Why was Tony Stewart allowed to race?

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With his history of violent incidents, why was NASCAR's Tony Stewart even allowed to race? CNN's Rachel Nichols reports.