Originally Posted by Saritz
Never heard of an SSN on a license either.

My DS's public elementary school has 800 students and is in an urban area. If they didn't check id for people entering the school, it would mean that ANYONE could go in. The front desk staff can't possibly keep up with the parents, step parents grandparents aunts and uncles of 800 kids.
I was surprised and shocked by this as well but turns out that it is legal for the Social Security number to be used as the Driver's License number. http://www.ssa.gov/history/reports/ssnreportc6.html