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DES MOINES — Iowa hemp retailers are raising concerns after federal lawmakers passed legislation banning hemp products this week while reopening the government.

Restrictions on hemp-derived products containing tetrahydrocannabinol, or THC — the psychoactive substance in cannabis that causes a high — were folded into a government shutdown-ending piece of spending legislation signed into law by President Donald Trump Wednesday evening. Impacted products include beverages, edibles and topicals. Hemp is a form of the cannabis plant that has very low percentages of THC.

The provision would prohibit products containing more than 0.4 milligrams of THC per container, which is significantly lower than

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