It is highly unlikely that Brad Pitt will be prosecuted for the abuse allegations against him. TMZ reports that although the FBI is investigating an incident between Brad, 52 and his 15-year-old son Maddox, which occurred on their private jet, the case is likely to be dropped as conflicting accounts make it impossible to prove what happened. And according to the website: "DCFS [Department of Children & Family Services] social workers saw no evidence of injuries on Maddox and no one filed a police report after the incident." Sources close to Brad have previously insisted that allegations of abuse against him are "exaggerated and fabricated" with sources close to the actor hitting out at the "smear campaign" against him. A source told DailyMail.com: "These claims are exaggerated and fabricated. "It's unfortunate for the whole family that people are insisting on continuing this endless smear campaign against Brad that hurts everyone. "They are a solid family with two caring parents and a normal share of verbal disagreements like major households. "Hopefully people can move on and leave them all alone to work this out." It has been claimed that Maddox stepped in when a row between Brad and his now-estranged wife Angelina Jolie became heated on board a private plane from France to Los Angeles earlier this month. Maddox was adopted by Angelina from Cambodia when he was only a few months old in 2002 and Brad, who started dating Angelina a few years later, adopted him in 2006. The couple also have children Pax, 12, Zahara, 11, Shiloh, 10, and twins Knox and Vivienne, eight together and all six children were onboard the flight when the row broke out. However, Brad, 52, is said to be hopeful that the allegations will be dropped soon after cameras at Minnesota's International Falls Airport - where the plane stopped to refuel - captured the argument. A source told US Weekly: "Brad is seen yelling a lot during it, but nothing physical."