What identification is required to enter Canada from the U.S.?
All drivers must have a valid driver’s license for the transport unit they are operating.
All drivers and passengers must have a valid passport or Free and Secure Trade (FAST) identity card.
A criminal record may require a pardon/waiver prior to gaining entry into Canada. For example, a DUI offense appears on a criminal record and could present problems when crossing the border
Further information on the requirements for Americans travelling to Canada is available at https://travel.state.gov/content/passports/en/country/canada.html.