Captain Cragen tells Rollins and Finn to check the controlled substance database to see what Dr. Brightman has been writing prescriptions for, especially to check for the anesthetic propofol. However while it is only available by prescription, propofol is not a controlled substance and therefore would not show up on the list of controlled substances prescribed by Dr. Brightman.
When reviewing the list of controlled substances prescribed by Dr. Brightman there are several errors regarding the medications. First off Dr. Brightman was prescribing OxyContin, which is a long acting form of oxycodone, it is only allowed to be prescribed for chronic, long-term pain that requires opioids 24 hours per day, not post operative pain. A oral cosmetic surgeon prescribing OxyContin, or any other long acting opioid, would look suspicious and likely be investigated at by the DEA.