The two states filed a lawsuit seeking a court order to prevent Colorado from enforcing the measure known
as Amendment 64, which was approved by voters in 2012 and allows recreational marijuana for adults over
21. The complaint says the measure runs afoul of federal law and therefore violates the Constitution’s
supremacy clause, which says federal laws trump state laws.

Colorado Attorney General John Suthers said the lawsuit was without merit.

"Because neighboring states have expressed concern about Colorado-grown marijuana coming into their
states, we are not entirely surprised by this action," he said. "However, it appears the
plaintiffs’ primary grievance stems from non-enforcement of federal laws regarding marijuana, as opposed
to choices made by the voters of Colorado."

The lawsuit says Colorado marijuana flows into neighboring states undermining their efforts to enforce
their anti-marijuana laws.

"This contraband has been heavily trafficked into our state," Nebraska Attorney General Jon
Bruning said at a news conference in Lincoln. "While Colorado reaps millions from the sale of pot,
Nebraska taxpayers have to bear the cost."

Colorado has raised more than $60 million in taxes, licenses and fees from medical and recreational
marijuana, which has been sold in stores since January.

The lawsuit says the sales have strained Nebraska and Oklahoma’s finances and legal systems. Police are
spending more time and money making arrests, housing inmates, impounding vehicles, seizing drugs and
handling other problems related to Colorado pot.

Bruning, a Republican, blamed U.S. Attorney General Eric Holder for failing to enforce the federal law’s
ban on drugs in Colorado.

In a policy statement last year, the U.S. Justice Department noted it doesn’t have the resources to
police all violations of federal marijuana law. It laid out eight federal law enforcement priorities
that states need to protect if they want to authorize "marijuana-related conduct." They
include keeping marijuana in-state — something Oklahoma and Nebraska says Colorado has failed to do. The
suit doesn’t contain statistics to support the claim.

Law enforcement agencies have long said anecdotally that they are feeling the impacts of Colorado’s legal
weed, making more marijuana arrests and seizing more of the drug.

But there’s no way to know exactly how much legal pot is leaving Colorado.

The Rocky Mountain High Intensity Drug Trafficking Area wrote in a recent report that the amount of
Colorado pot seized on highways increased from an annual average of 2,763 pounds between 2005 and 2008
to a yearly average of 3,690 pounds from 2009 to 2013. The weed was headed for at least 40 different
states.

Scotts Bluff County Sheriff Mark Overman, in western Nebraska, said Colorado marijuana is extra potent,
making it worth more in his region and giving sellers a greater financial incentive to do business
there.

"I think this is overdue, and I think other states should jump on board," Overman said of the
lawsuit. "I’m very frustrated. I take an oath of office, as does every other police officer in this
country. I don’t just get to pick and choose which laws I enforce."

Colorado Gov. John Hickenlooper told The Denver Post he spoke with Nebraska and Oklahoma officials about
their concerns.

"I’m not sure filing a lawsuit is the most constructive way to find a solution to whatever issues
they are," he said.

Legal scholars say it’s too early to know how the Supreme Court might handle the case or if it will even
accept it.

"Right now, these regulations exist in legal no-man’s-land," said Sam Kamin, a University of
Denver law professor. "It’s incredibly unusual for a state to be suing another state. (The lawsuit)
certainly was a surprise to me given the movement at the federal level, which seems to be in favor of
allowing states to experiment."

It was unclear if other neighboring states would take similar action. Attorneys general in Utah and New
Mexico said they had no immediate plans to join the suit.

Brian Vicente, a Colorado attorney and legalization advocate who wrote Amendment 64, said the challenge
is "political grandstanding" without merit. He said 23 states have enacted medical marijuana
laws, and none have been overturned because of federal law.

"I think it shows they are on the wrong side of history," Vicente said. "Colorado voters
passed this measure, and more and more states are passing these laws. If the attorney general has a
problem with how federal laws are being enforced he should bring that up with the U.S. attorney."

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Schulte reported from Lincoln, Nebraska.