Doug's question has been asked & answered, so I'll raise a couple others in the hope Brian revisits the scene.
So do I go with the Jack Nicholson from The Shining
"I'm baaaaack" or maybe General MacArthur "We shall return." but I digress. In the link Derwood provided, you'll note that checking ID is not on the list of steps.
VISA Operating Rules for October 15, 2013 have a chart on page 432-433 outlining what a merchant can do. (Checking ID is only allowed for cash advances.)
1. Verify that the signature on the Card matches the signature on the Transaction Receipt and, if applicable, identification presented. This signature may be different from the name embossed or printed on the Card.
2. Check one or more Card security features, as specified in the Visa International Operating Regulations or the Merchant Agreement, if applicable.And the kicker...
An Acquirer must not require a Merchant, and a Merchant must not require a Cardholder, to provide any supplemental Cardholder information as a condition for honoring a Card, unless it is required or permitted elsewhere in the Visa International Operating Regulations. Such supplemental Cardholder information includes, but is not limited to:
A government-assigned identification number (or any part thereof)
A government-issued identity card
Home or business address or telephone number
Driver's license number
Photocopy of a driver's license
Photocopy of the Card
Other credit cards
MasterCard Rule 5.10.4 of the December 2013 edition discusses this issue as well.
5.10.4 Additional Cardholder Identification
A Merchant may request but must not require a Cardholder to provide additional identification information as a condition of Card acceptance, unless such information is required to complete the Transaction, such as for shipping purposes, or the Standards specifically permit or require such information to be collected. A Merchant in a country or region that supports use of the MasterCard Address Verification Service (AVS) for MasterCard POS Transactions may require the Cardholder’s ZIP or postal code to complete a Cardholder-Activated Terminal (CAT) Transaction, or the Cardholder’s address and ZIP or postal code to complete a mail order, phone order, or e-commerce Transaction.
As for "See ID" VISA/MC consider an unsigned card to be invalid. A merchant following VISA/MC rules should instruct the cardholder to sign the card, check ID, and proceed with the transaction. If the cardholder refuses, the merchant should refuse to process the transaction.