In some cases, the penalties imposed by a court, such as the terms of a probation or conditional sentence order, may prohibit a person from traveling for a period of time. However, in virtually all cases, the longer term concern would be your ability to enter another country. Every country is free to set whatever rules it wishes in terms of who they will allow to visit. Canada shares with some countries, but not others, access to a database that lists criminal convictions. Canada does, for example, share access to the database with the United States. In most cases, a drug conviction in Canada would make a person ineligible to enter the United States indefinitely.