State police said the traffic stop happened overnight on northbound I-57 Thursday into Friday, though they did not give details regarding where on I-57 it occurred. They only said it happened in "northeastern Illinois."
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ISP said troopers seized almost 60 kilos, or 123 lbs., of counterfeit drugs laced with fentanyl.
They said the street value of the 500,000 laced pills is $5 million to $10 million.
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Police did not say how many people were arrested in the traffic stop, or how the pills were found.