I hold teaching certificates in three states. I was originally certified in New York, taught in Maryland for a year, and have my five-year certificate in Virginia. My New York and Maryland certificates both expire this year, and I'm debating whether or not to renew them. My Maryland certificate I'll probably let expire either way... I don't see myself ever teaching in Maryland again. Really, it's my New York certificate that I'm questioning. On one hand, if I ever decided to move back, having the certificate in hand would make life easier. One the other hand... well, money is tight and certificate renewal costs money. Does anyone keep certificates from multiple states active? Are there any benefits I'm missing to renewing my New York (or Maryland, for that matter) certificates?