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An Arnold man pleaded guilty to a federal meth-related charge Thursday and admitted buying more than 5,000 cold pills in 389 trips to pharmacies in eastern Missouri.

Leonard Wilson, 36, admitted that he sold the boxes to others knowing that the pills would be used to manufacture methamphetamine and that he used the money to pay child support and other expenses.

Wilson agreed that in total, his purchases between January 2007 and November 2009 totaled more than 300 grams but less than one kilogram.

In court filings before the guilty plea, Assistant U.S. Attorney Jennifer Winfield said that Wilson actually bought more than 6,700 pseudoephedrine pills on at least 453 separate trips to local pharmacies through 2010.

After detectives with the Jefferson County Municipal Enforcement Group came across Wilson's name in a search of pharmacy records for frequent pill-buyers, they went to Wilson's house in the 300 block of Oak Ridge Parkway. Wilson admitted re-selling the pseudoephedrine for $50- to $60 per box and using the money to pay child support and other expenses.

Wilson pleaded guilty Thursday to possessing pseudoephedrine, knowing that it would be used to manufacture methamphetamine. He could face roughly nine to 11 years in federal prison when sentenced later this year. If he had admitted to buying more than on kilo of pseudoephedrine, he could have faced even more time.