"The nurse hands me a bag and says, 'You might want to take this with you when you go to the emergency,'" Barnes told the television station.
Barnes used a ride-sharing service to take her son to the hospital. When they got to the emergency room, Barnes said she discovered the severity of Jason’s injury.
"When they unwrapped it and I saw the bone sticking out, I was like, 'Oh, my God, his finger is gone,'" Barnes told WDIV.
The family is seeking unspecified damages, saying that Jason had two surgeries and suffered pain, mental anguish, anxiety and humiliation, according to court documents.
School district spokeswoman Chrystal Wilson told the News that the district does not comment on pending litigation.
"You shouldn't be slamming doors, if you're that frustrated. You shouldn't even be dealing with kids, if you're that frustrated, because this is the product: my son now has an amputated finger," Barnes told WDIV.