Watch the special expanded series finale online now.
A spy camera is found in a Central Park public restroom. Benson and Stabler watch in horror as they see a 12 year old boy get molested in a bathroom stall. It turns out, it was the boy's principal and she is arrested after the two of them runaway together. While in police custody, she confesses to Stabler that after she molested her student they eventually became lovers.