GMAT Critical Reasoning (CR) | Re: Two years ago officials in Bedenia implemented landmark

Two years ago, officials in Bedenia implemented landmark drug legislation to combat an explosion of illegal drug use in the country’s major cities. Primarily, the legislation created new controls for preventing the entry of illegal drugs from the neighboring country of Gordenia, a major producer of marijuana. However, there has been no major decrease in illegal drug use over the past year in the country’s major cities; in fact, drug use has gone up slightly in that period.

Which of the following,