By Kristen Wyatt

The Associated Press

DENVER — The first recreational pot market in the United States notched another marijuana first Thursday when Colorado started using marijuana taxes to fund police efforts to crack down on illegal growing operations.

A measure signed into law by Gov. John Hickenlooper sets aside nearly $6 million a year in Colorado marijuana taxes to reimburse police for investigating black-market marijuana activity that authorities say has increased since the state legalized recreational marijuana in 2012.

“People say they’re trying to grow for medical purposes, or recreational uses, and instead, they’re shipping it out of state,” Hickenlooper said.

The fund was backed by police groups who complain that marijuana legalization has attracted illicit pot growers.

The bill was backed by Colorado’s nascent marijuana industry amid complaints that illegal growing operations undercut prices of pot grown legally and give legalization a bad name.

Oregon sets aside 20 percent of its pot taxes for “local law enforcement” in cities and counties, plus 15 percent for state police. But Oregon does not direct police to use that money to investigate black-market pot operations.

Colorado’s fund is the first in any state designated to specifically combat the black market. Colorado gave law enforcement about $1.7 million last year for other marijuana-related enforcement activities, such as training officers to spot stoned drivers.

The black-market grants are aimed at rural communities, where there may be no pot dispensaries and no local tax benefit from legalization.

Rural communities have attracted high-profile illicit drug operators accused of trying to exploit Colorado’s pot law to produce marijuana for sale out of state. The small towns where this has happened have limited police resources, and their officials said they cannot thoroughly investigate sprawling marijuana growing operations.

“An investigation like this can be very time-consuming and expensive,” said Michael Phibbs, of the Colorado Association of Chiefs of Police.

The U.S. government allowed Colorado’s marijuana legalization experiment on the condition that state officials act to prevent marijuana from migrating to states where it is outlawed and ensure that criminal cartels are kept out of the business.

The pot industry acknowledges the criminal activity and insists it is doing all it can to prohibit legally grown weed from crossing state lines. Among other safeguards, Colorado law requires growers to get licenses and use a “seed-to-sale” tracking system that monitors marijuana plants from when they are grown to when the finished product is sold in retail outlets.

“The black market certainly hurts the regulated industry,” said Kevin Gallagher, head of the Cannabis Business Alliance, a Colorado group representing the sector.

Raids across southeast Colorado in 2016 led federal authorities to seize more than 22,000 pounds of marijuana they said were intended for out-of-state sale.