Following up on the report that Peterson is under investigation for a second child abuse case involving one of his other children, sources close to the investigation tell TMZ the reason the case went nowhere is because Adrian did NOT strike the boy in the forehead -- but instead the child accidentally hit his head on a carseat while Adrian was punishing him. We're also told the form of discipline was "not impermissible." Under Texas law parents are allowed to administer reasonable punishment. Reported by TMZ.com
Peterson's attorney, Rusty Hardin, also told TMZ an adult witness backed him up, saying Adrian "did nothing inappropriate with his son." For the record, this new investigation involves an incident that allegedly went down in June 2013 ... and the probe was launched after the then 4-year-old boy went home to his mother with a scar on his forehead. The mother reported the incident to Child Protective Services, but no charges were ever filed against Peterson. ... Still, not a good look for Peterson, the Vikings or the NFL.