A Virginia primary school teacher's six-year-old son is unlikely to be accused, according to a lawyer.
Newport News officials have yet to decide if any adults will face criminal charges.
On January 6, police said the boy brought the gun to Richneck Elementary School in his backpack.
Abigail Zwerner, a teacher in her twenties, was struck twice but managed to pull through.
Portsmouth Wednesday's Commonwealth's Attorney Howard Gwynn revealed the child's acquittal.
"The prospect that a six-year-old can stand trial is problematic," he said.
Moreover, "our objective is not just to do something as quickly as possible," Mr. Gwynn emphasized.
"After reviewing the evidence, we will charge anyone we can prove committed a crime."
After a "altercation" with the first-grader, Ms. Zwerner is suing the school system.