When a store clerk asks for identification when you write a check, if your Social Security number is your driver’s license, the clerk will want to write that on your check.  Also, if your driver’s license is stolen, an individual can easily use your Social Security number and one other piece of identifying information (e.g., your name or address) and commit true identity theft.  The more your Social Security number is “out there,” the greater the chances of you becoming a victim of true identity theft.