Four people, including a Jefferson County inmate, were arrested and charged with smuggling drugs in the jail there.
Sheriff Peter Walker says three people bought marijuana in Madison County Saturday.
Cedric Woodberry, Ebony Love, and Lebertha Luckett then packed it into the soles of men's tennis shoes.
Investigators say when they visited inmate Jeremy Clark, Woodbury swapped shoes with him.
The Sheriff believes Clark intended to sell the pot to other inmates.
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