Given the devastating impact of impaired driving on Canadian society, it is no surprise that CCSA counts this issue among its highest priorities. It is a perennial problem, and one that has evolved considerably over the past 20 years. Since the early 1980s, the alcohol-crash problem in Canada has declined dramatically, but driving under the influence of alcohol remains a significant health and safety issue. At the same time, greater public and political attention is now being directed at the issue of driving under the influence of drugs. While this issue has yet to elicit the level of concern that surrounds drinking and driving, it has become a recognized road safety issue of its own.