Denver

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** FILE ** Employees trim retail marijuana at 3D Cannabis Center, in Denver, Thursday, May 8, 2014. (AP Photo/Brennan Linsley)

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Sen. Edward M. Kennedy, D-Mass.,waves after he spoke at the Democratic National Convention in Denver, Monday, Aug. 25, 2008. (AP Photo/Ron Edmonds)

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Rep. Jonathan Singer, D-Longmont, listens to discussion on a bill he sponsored which would allow marijuana dispensaries to form financial co-operatives, at the Colorado Legislature, in Denver, Wednesday May 7, 2014. (AP Photo/Brennan Linsley) ** FILE **

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U.S. Attorney John F. Walsh, District of Colorado, left, listens as Barbra Roach, center, special agent in charge of the DEA in Colorado speaks at a news conference at the DEA offices in Centennial, Colo., on Wednesday, May 7, 2014, where it was announced that a federal grand jury in Denver has returned indictments charging nine individuals from across the country with conspiracy and drug distribution charges related to "Spice". (AP Photo/Ed Andrieski)

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Barbra Roach, special agent in charge of the DEA in Colorado, speaks at a news conference at the DEA offices in Centennial, Colo., on Wednesday, May 7, 2014, where it was announced that a federal grand jury in Denver has returned indictments charging nine individuals from across the country with conspiracy and drug distribution charges related to "Spice". (AP Photo/Ed Andrieski)

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U.S. Attorney John F. Walsh, District of Colorado, speaks at a news conference at the DEA offices in Centennial, Colo., on Wednesday, May 7, 2014, where it was announced that a federal grand jury in Denver has returned indictments charging nine individuals from across the country with conspiracy and drug distribution charges related to "Spice". (AP Photo/Ed Andrieski)

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Confiscated synthetic drugs are on display at a news conference at the DEA offices in Centennial, Colo., on Wednesday, May 7, 2014, where it was announced that a federal grand jury in Denver has returned indictments charging nine individuals from across the country with conspiracy and drug distribution charges related to "Spice". (AP Photo/Ed Andrieski)

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Texas Rangers outfielder Mitch Moreland fills in as a relief pitcher against the Colorado Rockies in the eighth inning of an interleague baseball game in Denver on Tuesday, May 6, 2014. (AP Photo/David Zalubowski)

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Colorado Rockies' Carlos Gonzalez follows through with his swing after connecting for an RBI-single against the Texas Rangers in the sixth inning of an interleague baseball game in Denver on Tuesday, May 6, 2014. (AP Photo/David Zalubowski)

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Colorado Rockies starting pitcher Juan Nicasio works against the Texas Rangers in the first inning of an interleague baseball game in Denver on Tuesday, May 6, 2014. (AP Photo/David Zalubowski)

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Texas Rangers' Prince Fielder, right, argues a called strike three with home plate umpire Kerwin Danley to end the top of the first inning against the Colorado Rockies Texas of in an interleague baseball game in Denver on Tuesday, May 6, 2014. (AP Photo/David Zalubowski)