Do the math, and U.S. taxpayers paid $740.74 for each pot plant uprooted in New Hampshire that year.

That's an expensive weeding operation, but it could be worse. Utah received $73,000 in marijuana eradication funds, according to the federal documents obtained and published by journalist Drew Atkins. But agents failed to find a single pot plant to eradicate.

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The DEA's $14 million marijuana eradication program has been the subject of a fair amount of criticism in recent years. Twelve members of Congress have pushed to eliminate the program and use the money instead to fund domestic-violence prevention and deficit-reduction programs.

Its purpose is to “halt the spread of cannabis cultivation in the United States," a mission that has become complicated as more states have legalized medical or recreational marijuana programs. Several more states have similar measures on the ballot this year.

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DEA records show the program has been effective in some states, most notably California. Agents pulled 2.6 million marijuana plants in 2015, seizing more than 1,600 weapons in the process. Nearly $5.4 million was funneled into that state's program.

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Kentucky's $1.9-million program had the next largest number of eradicated plants, more than 570,000.

Nationwide, the DEA documents show that spending on the program has shrunk from about $18 million in 2014 to $14 million in the current fiscal year. Some states — including Alaska, Colorado and Vermont — stopped receiving eradication funds completely.

Here's where that money's going on a state-by-state basis.

California, where medical marijuana is legal, receives the lion's share of marijuana eradication funds, in part because the "Emerald Triangle" region of Northern California. The area has long been home to many of the state's legal and quasi-legal marijuana production operations, but law enforcement authorities have maintained that it also has been a haven for the grow operations of Mexican drug cartels.

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Kentucky also receives a large amount of money to eradicate marijuana. The state has a surprisingly rich culture of marijuana cultivation.

Rounding out the top 5 marijuana eradication states are Tennessee, Georgia and, perhaps unexpectedly, Washington. The aptly nicknamed Evergreen State legalized the recreational use of marijuana in 2012, and pot shops opened for business in 2014. So it may seem odd that the DEA is spending $760,000 this year to eradicate pot plants in the state.

But Washington is the only recreational marijuana state that doesn't allow people to grow their own plants for recreational use. (In D.C., incidentally, the situation is reversed: Homegrows are okay, but you can't buy weed at the store.)

Washington also receives more marijuana eradication money than any other state with a recreational pot regime in place. Oregon received $200,000 this year, while Colorado and Alaska didn't take any federal money for marijuana eradication.

You can also look at the 2015 marijuana eradication totals to compare the states based on how much they're spending per plant. Here's what that map looks like.

New Hampshire, Louisiana, Delaware, Utah and New Jersey all spent well over $100 for every marijuana plant eradicated. Eleven states spent at least $50 per plant, while nearly half of the states — 23 of them — spent at least $25 in federal money for each marijuana plant they eliminated.

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At the other end of the spectrum, states with big investments in marijuana eradication — like California and Kentucky — also had the most successful efforts to pull up large numbers of pot plants. So their per-plant costs are much lower.

To be perfectly clear, even in a fully legal, highly regulated market like Colorado's there will be a need to enforce prohibitions on large-scale, unlicensed marijuana grows — similar to the way the Bureau of Alcohol, Tobacco and Firearms busts illegal home alcohol distilleries. Beyond that, authorities often make a number of arrests at cultivation sites, or seize weapons and other property from people suspected of involvement with marijuana grow operations.

Still, some lawmakers are starting to question the need dedicated this level or resources to eliminating pot plants when so many states are relaxing their own restrictions.

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"It makes zero sense for the federal government to continue to spend taxpayer dollars on cannabis eradication at a time when states across the country are looking to legalize marijuana," Rep. Ted Lieu (D-Calif.) told me earlier this year. "I will continue to fight against DEA’s Domestic Cannabis Eradication/Suppression Program in Congress and work to redirect these funds to worthwhile programs."