EXCLUSIVE: Brad Pitt Takes Voluntary Drug Test, Leaning on Friends for Support Amid Angelina Jolie Split, Sour

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Brad Pitt has nothing to hide when it comes to any alleged drug use, a source close to the Pitt-Angelina Jolie child custody dispute tells ET.

The 52-year-old actor is reportedly being investigated for child abuse after getting into an argument with his and Jolie's 15-year-old son, Maddox, during a flight home on their private plane from Europe earlier this month. Our source says that while authorities did not require Pitt to take a drug test, he voluntarily took one as a sort of preemptive strike in the custody battle process.

"Brad Pitt voluntary took a drug test and was not asked to do so by authorities," the source says. "They didn't force him to take one because it wasn't part of the process."

WATCH: Brad Pitt Says He's 'Focused on My Family Situation,' Cancels First Public Appearance Since Angelina Jolie Filed for Divorce

According to our source, Pitt is currently in Los Angeles and keeping a low profile. Meanwhile, Jolie and their six kids are living in a rental mansion in Malibu, California, where they've been since news of the split broke last Tuesday. It is unclear when Pitt will see his children again.

"He's being careful," the source says of Pitt. "He's leaning on friends for support. This isn't a happy time for anyone."

The Allied star has yet to file a response to Jolie's divorce petition, which she filed last Monday. As for the state of the estranged couple's relationship, the source says the "fact that things have quieted down is a good sign for everyone."

"They both care about the kids," the source notes. "It's unfortunate that [there was] this campaign against him."

Last week, our source said Pitt was frustrated by the "smear campaign" being lodged against him.

"They are a pretty normal family that has family issues from time to time," the source said. "It's sad that people are exaggerating things that hurt everyone."

"People have verbal arguments -- that's what happens when you have a family," our source continued.

As for the incident between Pitt and Maddox, the source called the dispute "totally a child-parent disagreement," and said that any reports of inappropriate physical conduct are "exaggerated or untrue."

WATCH: Angelina Jolie's Inner Circle -- Meet the Women Helping Her Through the Brad Pitt Split

Jolie, 41, has asked for physical custody of their children in her divorce filing, which in addition to Maddox, includes 10-year-old Shiloh, 12-year-old Pax, 11-year-old Zahara, and 8-year-old twins Vivienne and Knox. Our source tells ET, however, that Pitt wants to be with his kids and have some custody.

Pitt is still hoping to resolve his and Angelina Jolie's issues "amicably and privately," the source told ET on Monday.

Watch below:

Related Gallery