Photo: Mark Wilson/Getty Images

A new study pours even more cold water — and there's already been a lot of cold water here — on the idea that the Medicaid expansion has fueled the opioid epidemic.

The details: The study, from the University of Pennsylvania’s Leonard Davis Institute of Health Economics, shows that the rate of overdose deaths in Medicaid expansion states is lower, not higher, than in non-expansion states.

  • It looks at three states that expanded Medicaid before the Affordable Care Act: Arizona, Maine and New York. (The authors say that’s because the opioid epidemic was already underway when the ACA’s Medicaid expansion began.)
  • It found that opioid deaths rose more slowly in those states than in nearby states that didn’t expand Medicaid, as well as in all non-expansion states.

The bottom line: A lot of the “Medicaid is bad for opioids” argument is built on the idea that Medicaid expansion gives people more access to opioids. But multiple studies have questioned that theory, and Medicaid expansion is also a critical avenue to expand treatment for addiction.

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Updated 42 mins ago - Politics & Policy

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Illustration: Sarah Grillo/Axios

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Arrest over letter to Trump containing poison ricin

President Trump returning to the White House from Minnesota on Sept. 18. Photo: Win McNamee/Getty Images

A suspect was arrested for allegedly "sending a suspicious letter" after law enforcement agents intercepted an envelope addressed to President Trump containing the poison ricin, the FBI confirmed in an emailed statement to Axios Sunday.

Details: The suspect, a woman, was arrested while trying to enter New York from Canada, law enforcement forces said.

Trump campaign goes all in on Pennsylvania

Trump poster in Scranton, Pennsylvania. Photo: Robert Nickelsberg/Getty Images

The president's campaign is placing more importance on Pennsylvania amid growing concern that his chances of clinching Wisconsin are slipping, Trump campaign sources tell Axios.

Driving the news: Pennsylvania, which has 20 electoral votes, twice Wisconsin's number, actually has been trending higher in recent public and internal polling, a welcome development for the campaign.