No what? There are controlled substances. There are scheduled substances. There are both controlled and scheduled substances. Controlled substances "that are always illegal like cocaine" are also scheduled as well (schedule II - note it is legally used by medical professionals). Xanax requires a prescription to purchase and possess because it is scheduled too (schedule IV dude). Being scheduled as well as controlled is the key. Tramadol and many other drugs are controlled but unscheduled and thus require a prescription to purchase but not to keep. I know, it's a paradox.