From the Canadian Press:
Tracing Internet pharmacy co-signing a Sherlock Holmes job for regulators
It will take more than tough talk from politicians or changes to federal law to catch Canadian doctors who co-sign Internet pharmacy prescriptions, say medical and pharmacy watchdogs.

Regulatory bodies for doctors and pharmacists say tracking guilty doctors has become a frustrating, time-consuming Sherlock Holmes exercise that is further complicated by provincial laws and confidentiality rules. "The access to the information is severely restricted," said Dr. Bill Pope, registrar of the College of Physicians and Surgeons of Manitoba.