JEFFERSON COUNTY, CO - JULY 17: Mary Mahaffey a plant health safeguarding specialist with the USDA holds a sample of an emerald ash borer collected in Michigan. Mahaffey was inspecting emerald ash borer traps that had been set out in Jefferson County by the Foothills Park and Recreation District. They were checking the trees on Friday July 17, 2015. They checked two traps and did not find any evidence of any the borers. (Photo by Cyrus McCrimmon/The Denver Post via Getty Images )
