Law enforcement officers in the U.S. are struggling to tackle a resurgent methamphetamine problem that's been growing in the shadow of the opioid crisis, as much of the market's supply has shifted from a homemade product made in domestic labs to a purer and cheaper narcotic imported by foreign cartels.

"Demand is of course there, as it always has been – I would say it has gone up. But the supply … there's just so much more of it," says Sgt. Rick Jackson of the Pendleton Police Department in eastern Oregon.

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