Reports: Brad Pitt takes voluntary drug test

Brad Pitt voluntarily took a drug test in an effort to cooperate with a Los Angeles Department of Children and Family Services investigation, People and TMZ report.

Pitt's representative did not immediately respond to USA TODAY's request for comment.

The test took place within days of the Sept. 14 incident on the family's private plane during the trip back from France in which Pitt is said to have physically and verbally abused one of the couple's six children.

Jolie filed for divorce the following Monday, citing irreconcilable differences and listing Sept. 15 as their separation date. "This decision was made for the health of the family," her lawyer, Robert Offer, told USA TODAY in a statement the following day.

Under California law, DCFS investigates every complaint report it receives. A spokesperson for the department told People that drug and alcohol tests are standard practice in child-abuse investigations.

According to the independent medication information site Drugs.com, frequent marijuana use can register in urine analysis from anywhere from one to three months depending on factors such as an individual's size and metabolism.

Brad Pitt, accused of child abuse, is under investigation

As New York divorce lawyer  Neena Tankha explained to USA TODAY, "(An investigation) almost always involves meeting with the accused parent, meeting with the child and meeting with any witnesses who were present during the incident. From there, the case worker will prepare a report of his/her findings. In the event Angelina continues to pursue litigation to gain custody of the children, the case worker’s report will surely come into play."

A source close to Pitt, who was not authorized to speak publicly, told USA TODAY at the outset of the investigation that the 52-year-old actor took the matter "very seriously and is fully cooperating. The claims are greatly exaggerated or fabricated. But he’ll always do whatever is best for his kids. Despite being on the receiving end of an onslaught of allegations, he remains focused on doing whatever is best for the children.

Child abuse claims help poison Brangelina divorce

Pitt has 30 days from the time of Jolie's Sept. 19 filing to submit his legal response.

 Contributing: Andrea Mandell, Maria Puente