Across the country, law enforcement long accustomed to seizures of bagged, smokable marijuana are now wrestling with a surge in pot-infused snacks and confections transported illegally across state lines for resale.

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After nearly 20 years on the job, Jim Jeffries, the police chief in LaFollette, Tenn., has seen his share of marijuana seizures — dry green buds stashed in trunks or beneath seats, often double-bagged to smother the distinctive scent.

But these days, Jeffries is on the lookout for something unexpected: lollipops and marshmallows.

Recently his officers pulled over a Chevy Blazer driven by a couple with three children in tow. Inside, the officers discovered 24 pounds of marijuana-laced cookies and small hard candies shaped like gingerbread men, plus a tub of pungent marijuana butter perfect for making more.

The bags of Kraft marshmallows looked innocent enough. But a meat injector was also found in the car. After searching the Internet, Jeffries realized that the marshmallows probably had been infused with the marijuana butter and heat-sealed into their bags.

“This is the first time that we have ever seen marijuana butter or any of this candy containing marijuana in the county,” Jeffries said. “We hope it’s the last time.”

That seems increasingly unlikely. Across the country, law enforcement long accustomed to seizures of bagged, smokable marijuana are now wrestling with a surge in marijuana-infused snacks and confections transported illegally across state lines for resale.

Pot edibles, as they are called, can be much easier to smuggle than marijuana buds: They may resemble candy or home-baked goodies, and often have no telltale smell. And few police officers are trained to think of gummy bears, mints or neon-colored drinks as potential dope.

Some experts worry that smuggled pot edibles will appeal to many consumers, particularly adolescents, who are ill prepared for the deceptively slow high. Impatient novices can easily eat too much too fast, suffering anxiety attacks and symptoms resembling psychosis. Already, young children have eaten laced sweets left within reach.

Many live in states where there has been no public education about responsible consumption of marijuana.

“Citizens in nonlegalization states are far less likely to be receiving those messages, so their risks are probably greater,” said Robert MacCoun, a professor of law at Stanford who recently co-wrote an editorial in The New England Journal of Medicine urging stronger regulation of pot edibles.

There are no hard numbers for the amount of pot edibles being trafficked interstate, but police departments in a variety of jurisdictions without legal sales report seizing increasing amounts in the past year. The quantities suggest the products are intended to supply a growing demand, law-enforcement officials say.

In February, Missouri troopers confiscated 400 pounds of commercially made marijuana chocolate, including Liquid Gold bars, hidden in boxes in an Infiniti QX60. The driver was arrested on suspicion of possession with intent to distribute a controlled substance.

In states where marijuana remains illegal, some entrepreneurs have begun cooking large batches of pot edibles for sale. In February, an illegal bakery making marijuana brownies and cookies in an industrial-size oven was shut down in Warren County, Ohio.

The popularity of confections laced with marijuana has caught many health officials by surprise. Pot edibles took off in 2014, the first year of recreational sales in Colorado, when nearly 5 million individual items were sold to patients and adult users.

Demand in Colorado and Washington state has spawned a stunning assortment of snacks and sweets, from Mondo’s sugar-free vegan bars to Dixie Edibles’ white chocolate peppermint squares.

Today consumers 21 and older can legally buy pot edibles in those two states; soon adults in Oregon and Alaska will join them. Pot edibles are available to medical users in at least half a dozen of the 23 states with medical marijuana programs.

Edibles make sense for marijuana entrepreneurs. In the past, marijuana buds were sold and the rest of the plant usually discarded. But with an extraction machine, makers of edible products can use the entire plant.

“In a world where THC becomes inexpensive, you would like to differentiate your product from other people’s products in ways that allow you to maintain a higher profit margin,” said Jonathan Caulkins, a co-author of “Marijuana Legalization,” who has studied black markets for cocaine and marijuana. “Edibles offer some opportunities for that.”

Until last year, Sgt. Jerry King, who works for a drug task force in Alabama, had never seen pot edibles in the mail. In February, postal inspectors flagged a package, and the task force seized roughly 87 pounds of smokable marijuana and 50 packages of marijuana candies.

Law-enforcement officials say it is not yet clear how smugglers are laying hands on large quantities of prepackaged pot edibles.

“It’s just now gaining in popularity,” King said of pot edibles in north Alabama. “We’ll try to stay on top of it.”