Two Oklahoma residents are claiming that the 7% marijuana tax is illegal, and they want every patient who's paid it to be reimbursed.

Adrian Keith Johnson and Tracy Neeley filed a lawsuit in Oklahoma County against the Oklahoma Tax Commission and state treasurer. The lawsuit claims that the 7% excise tax on all medical marijuana sales is unconstitutional based on Oklahoma's strict rules about creating new taxes.

They also suggest a fix — the creation of a refund program that will return "more than one billion dollars" to patients who paid it. The lawsuit claims that, with compounded interest, Oklahoma's Tax Commission has collected more than $1 billion from patients buying medical marijuana.

Their numbers don't add up, though.

Each month, the OTC publishes details about medical marijua

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