If you enter a formal, structured pain management program you will be required by the doctor to sign a "Narcotics Contract," or some similar document. This document will require you to promise to take your pain medicine exactly as prescribed and take only those medicines.
You will be required to give a urinalysis sample or mouth swab. If the urinalysis or mouth swab show drugs other than those prescribed or an unusually, unexpectedly low amount of narcotics concentration in your body, you will be terminated as a patient.
Taking drugs not prescribed for this injury: You cannot use old medication you get from your dentist. You cannot use your spouse's medication.
Also, not taking your narcotic pain medicine will get you terminated because the doctor will assume that since you are not taking your medicine: 1.) You must not need it. 2.) You must be selling it.
If you are terminated from a pain management program due to alleged violation of your Narcotics Contract, it is highly unlikely another doctor will accept you as a patient, and you will be unable to get the treatment and pain medicine that you need.