Identification requirements changed in January 2008.
Effective January 31, 2008, U.S. and Canadian citizens ages 19 and older should no longer expect that they will be able to prove identity and citizenship by relying on an oral declaration alone. Instead, travelers will be asked to present documents from one of the options below when entering the United States at land or sea ports of entry. Travelers who do not present one of the documents listed below may be delayed as U.S. Customs and Border Protection officers attempt to verify their identity and citizenship.
U.S. and Canadian Citizens – Single Document Option
One of the following documents should be presented to prove both identity and citizenship.
Acceptable Documents as of January 31:
U.S. or Canadian Passport
U.S. Passport Card (Available spring 2008)*
Trusted Traveler Cards (NEXUS, SENTRI, or FAST)*State or Provincial Issued Enhanced Driver’s License (when available – this secure driver’s license will denote identity and citizenship.)*
Enhanced Tribal Cards (when available)*
U.S. Military Identification with Military Travel Orders
U.S. Merchant Mariner Document
Native American Tribal Photo Identification Card
Form I-872 American Indian Card
Indian and Northern Affairs Canada (INAC) Card
* Frequent Land Border Crossers — to expedite processing into the United States, U.S. Customs and Border Protection recommends using one of the above asterisked documents.
U.S. and Canadian Citizens – Two Document Option
All U.S. and Canadian citizens who do not have one of the documents from the list above must present BOTH an identification and citizenship document from each of the columns below.
Driver’s license or identification card issued by a federal, state, provincial, county, territory, or municipal authority
U.S. or Canadian military identification card
* All identification documents must have a photo, name and date of birth.
U.S. or Canadian birth certificate issued by a federal, state, provincial, county, territory or municipal authority
U.S. Consular report of birth abroad
U.S. Certificate of Naturalization
U.S. Certificate of Citizenship
U.S. Citizen Identification Card
Canadian Citizenship Card
Canadian certificate of citizenship without photohttp://www.cbp.gov/xp/cgov/travel/vacation/ready_set_go/land_travel/chnge_in_proced.xml
Unless the DL is the enhanced DL, they need additional documentation. I would consider revising your policy to reflect the changes above.