In light of accusations of child abuse, Brad Pitt has reportedly taken a drug test voluntarily and is cooperating fully with the Department of Children and Family Services, according to People. Pitt has been accused of being “verbally abusive” and getting “physical” with his son Maddox, 15, while he and wife Angelina Jolie were returning from France to their L.A. home on a private plane on September 14. The case was referred to the FBI under special aircraft jurisdiction, as the incident occurred mid-flight. An investigation into the alleged incident is being considered. “He takes the matter very seriously and says he did not commit any abuse of his children,” a source close to Pitt told the magazine. Jolie requested sole physical custody of the couple’s six children when she filed for divorce in Los Angeles last week.