https://www-nytimes-com.cdn.ampproject. ... imits.html
LIES: A Medicare official who would speak only on background said that the limit for monthly high doses was intended not only to catch doctors who over-prescribe, but also to monitor patients who, wittingly or not, accumulate opioid prescriptions from several doctors (Its impossible to get that with the programs in place to monitor prescriptions) . When the dose is flagged, the pharmacist or patient alerts the doctor.

Mr. Zobrosky’s medication regimen is strictly monitored at home. He submits to random urine tests and brings his pills to his doctor to be counted.CreditEamon Queeney for The New York Times