Please Note: Canada, like the United States, has rules that prohibit entry for persons with specific ineligibilities. For example, anyone with a criminal record (including misdemeanors or Driving While Impaired (DWI)), no matter how long ago, may be barred from entering Canada and must obtain a special waiver well in advance of any planned travel. To determine whether you may be inadmissible and how to overcome this finding, please refer to the Citizenship and Immigration Canada website.
http://travel.state.gov/travel/cis_p...y_requirements
How is this a safety or security issue ?