Is there a law that states social security numbers cannot be used for identification purposes?

My company hires contractors that are already employed by another company, they are mainly costruction worrkers, who are required by my company to provide the last four of their SSN to obtain an access badge.Is there a law that states social security numbers cannot be used for identification purposes?
I don't think there is a law that says SS#s can't be used for ID purposes. However, It happens all the time





SS#s need to be provided to your employer so that they can withhold taxes. If you want a loan, the creditor will want to know your SS# to do a credit check. An unavoidable consequence of the rampant use of SS#s for non Social Security purposes.





But they needn't be used for ANY other purpose. Some states use them as drivers license numbers, some universities use them as the student ID numbers. Invariably, they get all bent out of shape when someone doesn't want to provide the number for a non Social Security Administration purpose.





If these workers are not paid directly by your company then the worker should be able to provide some other form of ID to get the access badge. Your company should accomodate the wishes of the worker and issue him/her a unique ID# for the badge.





SS#s are used as an ID number because it will be unique to the individual and the employer doesn't have to worry about re-issuing an old number.

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