On 15 September 2015, the College of Pharmacists of British Columbia (BC) implemented a set of by-law and security policy changes in an effort to reduce robberies and burglaries in BC pharmacies. Prior to these by-law and security policy changes, pharmacy robberies were increasing in BC for approximately 5 years. After implementation, pharmacy robberies decreased significantly. In this paper, we evaluate the potential impact of the by-law and security policy changes on pharmacy robberies in four regions within BC. We find strong evidence supporting that the reduction in pharmacy robberies is a result of this by-law and accompanying security policy changes. Specifically, there was an immediate and substantial drop in pharmacy robberies within Vancouver, with a change in trend (now decreasing instead of increasing) for the Interior and Lower Mainland less Vancouver. These results should be considered support for maintaining these by-laws and security policy changes in BC and potential implementation in other areas of Canada experiencing similar issues.