This Dec. 12,2012 photo shows a sign welcoming visitors to the Blackfeet 

This Dec. 12,2012 photo shows a sign welcoming visitors to the Blackfeet Indian reservation on Dec. 12, 2012. Glacier officials are concerned about the effects of oil development on the reservation, and are asking for an in-depth study on the environmental impacts. Blackfeet tribal officials say they are complying with all requirements before drilling and they bristle at the suggestion they can't develop their resources safely. (AP Photo/Matt Volz).
Associated Press
This Dec. 12,2012 photo shows a sign welcoming visitors to the Blackfeet Indian reservation on Dec. 12, 2012. Glacier officials are concerned about the effects of oil development on the reservation, and are asking for an in-depth study on the environmental impacts. Blackfeet tribal officials say they are complying with all requirements before drilling and they bristle at the suggestion they can't develop their resources safely. (AP Photo/Matt Volz).
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