TIFTON, GA (WALB) - Surveillance footage appears to show a teacher knocking down a student in the hallway at school.The special education teacher, identified as Amelia Stripling, has since resigned.It happened at the Tift County Pre-K Center in Tifton on March 17.The child's mother, Sarah Patterson, said her special-needs son just turned 4 years old on Wednesday.She said Stripling thrust her knee into the little boy's back, causing him to fall.Tift County School officials said the young boy was not injured, and reported the incident to the Division of Family and Children Services.Patterson said she has also obtained a lawyer.There was no immediate word whether Stripling had done the same.Amelia Stripling's teacher page has since been removed from the school's website.Officials said she had worked for the school system for more than 20 years.