Brad Pitt Prosecution 'Highly Unlikely' in Jet Incident

It's almost certain Brad Pitt will not be prosecuted for any alleged assault against his son ... so say multiple law enforcement sources involved in the case.

Our sources say, with the conflicting accounts of what happened between Brad and 15-year-old Maddox 30,000 feet above the ground, there's no way to conclusively prove Brad intentionally inflicted harm on his son.

As we reported, there are conflicting stories about the events leading to the confrontation on the jet. Based on all of our sources we believe the most credible sequence of events is that Maddox said something to Brad that pissed him off, Brad then lunged at his son, Angelina stepped in between them and at that point there was some physical contact between Brad and Maddox.

It appears Brad made contact with Maddox somewhere in the vicinity of the shoulder area. The biggest issue -- whether it was intentional or inadvertent. It's the job of prosecutors to prove it was intentional, and we're told that would be extremely difficult.

On top of that, we're told DCFS social workers saw no evidence of injuries on Maddox ... none.

And there's more ... no one filed a police report after the incident.

Finally, our sources say these cases are particularly difficult because of the blurred line between abuse and parental discipline.

As we reported, since the incident occurred in the air, the FBI has jurisdiction, and our law enforcement sources say it's "highly unlikely" anything will come of the agency's probe.

On the other hand, the L.A. County Dept. of Children's Services has a broader scope than the FBI. DCFS will go beyond the jet incident and talk to the kids and parents about the overall living situation.

Stay tuned.