Heather Revell of Holiday, Florida, was arrested on Sunday after a child in her care overdosed.
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The 1-year-old ingested leftover fentanyl that Revell had mixed with heroin.
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After paramedics arrived, the baby girl was given Narcan to offset the effects of the drug.
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Fentanyl is the most common drug involved in overdose deaths in the United States.
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In January, a couple was charged with murder after their daughter died of a fentanyl overdose.
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