This Is How Ann Arbor, Michigan Decides Which Teacher To Lay Off if Both Have Identical Years of Experience:

New Jersey Left Behind:

4.813.3 Experience shall mean months, days and years of certificated employment in the Ann Arbor Public Schools. If two or more teachers have the same seniority and the Board must decide on laying off one of the teachers, the last four digits of the teachers social security number will be used as a tie breaker. The lower number will have the most seniority.