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This conduct would likely be considered an anti-trust violation under the Sherman Anti-Trust Act, since McKesson is attempting to control the market and prohibiting or chilling the market for you to trade in. Since there is no legal violation, DEA has no cause to stick their nose in, this is something the manufacturer/supplier is taking on themselves to do this and you can pursue them, but because you are a business
you are going to have to engage a local anti-trust attorney to do so.
Your patients really do not have the claim, as they can get prescriptions filled at other businesses, it is your claim to make against the company.
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