This is not a tramadol specific thing, really. This applies to all substances that are merely controlled. A merely controlled substance cannot be sold without, but can be possessed without a prescription. For example, high blood pressure medicine, and thyroid medicine, etc., are controlled substances that can't be purchased without a prescription. However, if you were to "find" a box of zestril in the garage of your newly purchased home (or stumble upon it in some other way), you could keep it without fear of getting busted. It is entirely legal to do so. However, when a med is both controlled *and* scheduled, it can neither be purchased nor possessed without a prescription. This covers your opioids and stuff. I believe ultram will eventually be scheduled, but until it is, it's merely controlled. Believe it or not, 9 out of 10 cops go to erowid for dope facts. They had a piece about it on dateline or 20/20 showing the cops doing research via erowid... Oh great. I'll hunt around and see if I can't find something more conventional though.
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I'm floating around like a chicken with my legs cut off. I am the poultrygeist. Goo goo g' joob, and a cockadoodle BOO to you dude.