EXCLUSIVE: Brad Pitt takes voluntary drug test, leaning on friends for support amid Angelina Jolie split, source says

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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."

See photos of the couple through the years:

25 PHOTOS
The end of an era : Angelina Jolie and Brad Pitt
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The end of an era : Angelina Jolie and Brad Pitt
U.S. actors Brad Pitt (L) and Angelina Jolie (R), stars of the new action film "Mr. & Mrs. Smith" pose with one of the film's producers, Arnon Milchan of New Regency at the film's premiere in Los Angeles June 7, 2005. The film opens in the United States on Friday. REUTERS/Fred Prouser fsp/TC
Hollywood star Brad Pitt carries adopted son Maddox as Angelina Jolie carries adopted daughter Zahara during their stroll outside their hotel in Mumbai November 12, 2006. REUTERS/Prashanth Vishwanathan (INDIA)
Actors Angelina Jolie and Brad Pitt kiss at their table during the 14th annual Screen Actors Guild Awards in Los Angeles January 27, 2008. REUTERS/Mario Anzuoni (UNITED STATES)
Cast member Angelina Jolie and actor Brad Pitt arrive for the screening of the film "The Exchange" by U.S. director Clint Eastwood at the 61st Cannes Film Festival May 20, 2008. REUTERS/Vincent Kessler (FRANCE)
U.S. actors Brad Pitt and Angelina Jolie arrive with their children at Narita airport, near Tokyo, January 27, 2009. Pitt is in Japan to promote the film "The Curious Case of Benjamin Button". From L-R: Pax, Knox Leon (carried by Pitt), Maddox (obscured), Zahara, Vivienne Marcheline (carried by Jolie) and Shiloh. REUTERS/Toru Hanai (JAPAN) FOR BEST QUALITY IMAGE SEE: GM1E5BB1OIM01
Cast member Angelina Jolie and actor Brad Pitt attend the premiere of the movie "Salt" at the Grauman's Chinese theatre in Hollywood, California July 19, 2010. The movie opens in the U.S. on July 23. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
Actors Brad Pitt (R) and Angelina Jolie are seen on the set of Jolie's yet untitled directorial debut in Budapest November 8, 2010. Jolie is directing her first feature film about a Serbian man and Bosnian woman who meet on the eve of the 1992-95 Bosnian war. REUTERS/Laszlo Balogh (HUNGARY - Tags: ENTERTAINMENT)
Cast member Brad Pitt and actress Angelina Jolie arrive on the red carpet for the screening of the film "The Tree of Life", by director Terrence Malick, in competition at the 64th Cannes Film Festival, May 16, 2011. REUTERS/Vincent Kessler (FRANCE - Tags: ENTERTAINMENT)
U.S. actor Brad Pitt (L) and his partner Angelina Jolie arrive at the Japan premiere of Pitt's film "Moneyball" in Tokyo November 9, 2011. REUTERS/Toru Hanai (JAPAN - Tags: ENTERTAINMENT TPX IMAGES OF THE DAY)
Actors Brad Pitt and Angelina Jolie depart at the end of the 18th annual Screen Actors Guild Awards in Los Angeles, California January 29, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: ENTERTAINMENT) (SAGAWARDS-SHOW)
Actors Brad Pitt and Angelina Jolie arrive at the 84th Academy Awards in Hollywood, California February 26, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: ENTERTAINMENT) (OSCARS-ARRIVALS)
Angelina Jolie and Brad Pitt attend the "Cinema for Peace 2012" charity gala during the 62nd Berlinale film festival in Berlin February 13, 2012. REUTERS/Andreas Rentz/Pool (GERMANY - Tags: ENTERTAINMENT) SOCIETY)
An aerial view of the 17th-century Chateau Miraval, the $60 million estate which is owned by actors Brad Pitt and Angelina Jolie, is seen in the village of Correns, southern France, August 10, 2012. Rumours of a weekend wedding between Brad Pitt and Angelina Jolie have been denied by a local newspaper and local officials said they had no knowledge of any impending nuptials. Since Pitt and Jolie announced their engagement earlier this year, there have been rumours that they could tied the knot this summer at their estate. REUTERS/Philippe Laurenson (FRANCE - Tags: ENTERTAINMENT)
Actress and Special Envoy of the United Nations High Commissioner for Refugees, Angelina Jolie (R), and her partner actor Brad Pitt, look at photographs of victims of violence at the 'End Sexual Violence in Conflict' summit in London June 12, 2014. REUTERS/Lefteris Pitarakis/Pool (BRITAIN - Tags: SOCIETY CRIME LAW CIVIL UNREST)
Cast member Brad Pitt and his fiance Angelina Jolie arrive for the premiere of the film World War Z in Berlin June 4, 2013. The movie opens in German cinemas on June 27. REUTERS/Tobias Schwarz (GERMANY - Tags: ENTERTAINMENT)
Hollywood actors Brad Pitt (R) and actress Angelina Jolie (2nd L) arrive with their children Knox (2nd R), Vivienne (3rd L) and Pax (L) at Haneda international airport in Tokyo July 28, 2013. Pitt flew into Japan on Sunday with Jolie and his children to attend promotional events of his movie "World War Z". REUTERS/Issei Kato (JAPAN - Tags: ENTERTAINMENT)
Hollywood actor Brad Pitt and his partner Angelina Jolie pose at the Japan premiere of his movie "World War Z" in Tokyo July 29, 2013. The movie will be screened in Japan on August 10, 2013. REUTERS/Yuya Shino 
Angelina Jolie and partner Brad Pitt and son Maddox arrive at the 5th Annual Academy of Motion Picture Arts and Sciences Governors Awards in Hollywood November 16, 2013. Jolie is being honored with the Jean Hersholt Humanitarian Award, which is an Oscar statuette at the ceremony. REUTERS/Fred Prouser (UNITED STATES - Tags: ENTERTAINMENT)
Actress Angelina Jolie kisses her partner, actor Brad Pitt, as she is announced recipient of the Jean Hersholt Humanitarian Award at the 5th Annual Academy of Motion Picture Arts and Sciences Governors Awards at The Ray Dolby Ballroom in Hollywood, California November 16, 2013. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT TPX IMAGES OF THE DAY)
Actors Brad Pitt and Angelina Jolie arrive at the British Academy of Film and Arts (BAFTA) awards ceremony at the Royal Opera House in London February 16, 2014. REUTERS/Suzanne Plunkett 
Actors Brad Pitt and Angelina Jolie arrive for a special Maleficent Costume Display at Kensington Palace in London May 8, 2014. "Maleficent" is the upcoming Disney film starring Jolie and Kensington Palace is the official residence of Prince William and Catherine, Duchess of Cambridge. REUTERS/Luke MacGregor (BRITAIN - Tags: ENTERTAINMENT FASHION SOCIETY ROYALS)
Cast member Angelina Jolie waves at fans with actor Brad Pitt as they arrive at the premiere of "Maleficent" at El Capitan theatre in Hollywood, California May 28, 2014. The movie opens in the U.S. on May 30. REUTERS/Mario Anzuoni 
Angelina Jolie (L) and Brad Pitt arrive at the British Academy of Film and Arts (BAFTA) awards ceremony at the Royal Opera House in London February 16, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT)
Director and cast member Angelina Jolie and her husband and co-star Brad Pitt pose at the premiere of "By the Sea" during the opening night of AFI FEST 2015 in Hollywood, California November 5, 2015. The movie opens in the U.S. on November 13. REUTERS/Mario Anzuoni
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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."

See photos of Brad Pitt through the years:

43 PHOTOS
Brad Pitt through the years
See Gallery
Brad Pitt through the years
136698 06: Actor Brad Pitt from 'A River Runs Through It' September 15, 1991. (Photo by Liaison)
204937 03: Brad Pitt in the film 'Legends of the Fall.' (Photo by Liaison)
341913 01: Actor Brad Pitt in the film 'Meet Joe Black.' (Photo by Liaison)
TORONTO, CANADA: Film star Brad Pitt rushes into the world premier for his new film 'Seven Years In Tibet' at the Toronto Film Festival in Toronto, Canada, 13 September. Pitt was posing for photographers when a group of women started to rush across the street towards him and he hurried into the theatre. AFP PHOTO/Carlo ALLEGRI (Photo credit should read CARLO ALLEGRI/AFP/Getty Images)
372599 01: Brad Pitt Stars As Joe Black In Universal Pictures Recent Release 'Meet Joe Black'. Pitt Stars Along With Anthony Hopkins, Claire Forlani Under The Direction Of Martin Brest. (Photo By Getty Images)
LOS ANGELES, UNITED STATES: Actors Brad Pitt and Jennifer Aniston arrive for the 51st Emmy Awards 12 September, 1999, in Los Angeles, California. (Electronic Image) AFP PHOTO / Hector MATA (Photo credit should read HECTOR MATA/AFP/Getty Images)
369691 01: Brad Pitt And Julia Roberts Together For The First Time On Their First Day Filming Together In Dreamworks Pictures Action-Comedy, 'The Mexican' May 17, 2000 In Real De Catorce, Mexico. (Photo By Getty Images)
LONDON, UNITED KINGDOM - AUGUST 23: Hollywood actor Brad Pitt arrives at the london Premiere of his new film 'Snatch' 23 August 2000, in London West End. 'Snatch' is a movie directed by Guy Ritchie. (ELECTRONIC IMAGE) (Photo credit should read HUGO PHILPOTT/AFP/Getty Images)
Brad Pitt and Jennifer Aniston at the premiere of 'Rock Star' at the Mann Village Theater in Los Angeles, Ca. 9/4/01. Photo by Kevin Winter/Getty Images.
Brad Pitt at the premiere of 'Panic Room' at the Loews Century Plaza Theater in Los Angeles, Ca. Monday, March 18, 2002. Photo by Kevin Winter/Getty Images.
Brad Pitt at the premiere of 'The Bourne Identity' at Universal CityWalk in Los Angeles, Ca. Thursday, June 6, 2002. Photo by Kevin Winter/ImageDirect
WESTWOOD, CA - DECEMBER 11: Actors Don Cheadle (L) and Brad Pitt attend the premiere of the film 'Confessions Of A Dangerous Mind' on December 11, 2002 in Westwood, California. (Photo by Vince Bucci/Getty Images)
SANTA MONICA, CA - APRIL 12: Michelle Pfeifer and Brad Pitt during Nickelodeon's 16th Annual Kids' Choice Awards at the Barker Hangar April 12, 2003 in Santa Monica, California. (Photo by Robert Mora/Getty Images)
HOLLYWOOD - JANUARY 12: Actress Jennifer Aniston and actor Brad Pitt attend the Los Angeles premiere of Universal Pictures' film 'Along Came Polly' on January 12, 2004 at the Grauman's Chinese Theatre, in Hollywood, California. (Photo by Vince Bucci/Getty Images)
BERLIN - MAY 9: Actor Brad Pitt attends the official European premiere of long-awaited epic film 'Troy' at the Cinestar Cinema, Potsdamer Square May 9, 2004 in Berlin, Germany. The story is of two nations' battle after the prince of one steals the beautiful wife of the other. Precedes U.S. premiere tomorrow and international screening at Cannes, May 13. (Photo by Kurt Vinion /Getty Images)
CANNES, FRANCE - MAY 13: Actors Brad Pitt and Orlando Bloom attend the Photocall for 'Troy' ahead of tonight's World Premiere showing, at the 57th Annual Cannes Film Festival on May 13, 2004 in Cannes, France. (Photo by Bruno Vincent/Getty Images)
HOLLYWOOD - DECEMBER 8: Actor Brad Pitt arrives at the Warner Bros. premiere of the film 'Ocean's Twelve' at Grauman's Chinese Theatre December 8, 2004 in Hollywood California. (Photo by Vince Bucci/Getty Images)
WESTWOOD, CA - JUNE 07: Actor Brad Pitt arrives at the premiere of 'Mr. & Mrs. Smith' at the Mann Village Theater on June 7, 2005 in Westwood, California. (Photo by Kevin Winter/Getty Images)
BEVERLY HILLS, CA - JULY 20: Actor Brad Pitt poses at the Hollywood Foreign Press Association annual installation luncheon at the Beverly Hills Hotel on July 20, 2005 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)
DAVOS, SWITZERLAND: Actors Angelina Jolie (L) and Brad Pitt leave Hotel Belvedere in Davos 26 January 2006. UN goodwill ambassador Angelina Jolie is in Davos for the World Economic Forum. AFP PHOTO ERIC FEFERBERG (Photo credit should read Eric FEFERBERG/AFP/Getty Images)
CANNES, FRANCE - MAY 21: (EDITORS NOTE: THIS BLACK AND WHITE IMAGE WAS CONVERTED FROM ORIGINAL COLOUR FILE) Actors Brad Pitt and Angelina Jolie attend the premiere for the film 'A Mighty Heart' at the Palais des Festivals during the 60th International Cannes Film Festival on May 21, 2007 in Cannes, France. (Photo by Gareth Cattermole/Getty Images)
TORONTO - SEPTEMBER 10: Actor Brad Pitt attends 'Babel' press conference during the Toronto International Film Festival held at the Sutton Place Hotel on September 10, 2006 in Toronto, Canada. (Photo by Evan Agostini/Getty Images)
WASHINGTON - MARCH 05: Actor Brad Pitt attends with House Speaker Nancy Pelosi (D-CA) and Majority Whip Rep. James Clyburn (D-SC) a press conference following a meeting to discuss the 'Make it Right' project on March 5, 2009 in Washington, DC. The project, launched in 2007, helps to construct affordable and environmentally-sustainable housing for low-income residents of the Lower 9th Ward in New Orleans who lost their homes as a result of Hurricane Katrina. (Photo by Brendan Hoffman/Getty Images)
HOLLYWOOD - APRIL 06: Actor Brad Pitt onstage during the taping of Idol Gives Back held at the Kodak Theatre on April 6, 2008 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
WESTWOOD, CA - DECEMBER 08: Actor Brad Pitt arrives at the premiere of Paramount's 'The Curious Case Of Benjamin Button' held at Mann's Village Theatre on Decemeber 8, 2008 in Westwood, California. (Photo by Alberto E. Rodriguez/Getty Images)
Oscar-nominated actors Brad Pitt and Angelina Jolie arrive at the 81st Academy Awards at the Kodak Theater in Hollywood, California on February 22, 2009. AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
SAN SEBASTIAN, SPAIN - SEPTEMBER 18: Actor Brad Pitt attends 'Inglorious Basterds' photocall at the Kursaal Palace during the 57th San Sebastian International Film Festival on September 18, 2009 in San Sebastian, Spain. (Photo by Carlos Alvarez/Getty Images)
BEVERLY HILLS, CA - DECEMBER 03: Actors Brad Pitt (L) and Angelina Jolie arrive at the premiere of Warner Bros. Pictures' and Spyglass Entertainment's 'Invictus' at the Academy of Motion Picture Arts and Sciences Theater on December 3, 2009 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD - JULY 19: Actor Brad Pitt arrives at the premiere of Sony Pictures' 'Salt' at Grauman's Chinese Theatre on July 19, 2010 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
US actors Brad Pitt and Angelina Jolie pose as they arrive for the premiere of her movie The Tourist by German director Florian Henckel von Donnersmarck in Rome on December 15, 2010. AFP PHOTO / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)
US actor Brad Pitt attends the press conference of 'The Tree of Life' presented in competition at the 64th Cannes Film Festival on May 16, 2011 in Cannes. AFP PHOTO / ANNE-CHRISTINE POUJOULAT (Photo credit should read ANNE-CHRISTINE POUJOULAT/AFP/Getty Images)
US actor Brad Pitt and his wife, US actress Angelina Jolie, pose on the red carpet before the screening of 'The Tree of Life' presented in competition at the 64th Cannes Film Festival on May 16, 2011 in Cannes. AFP PHOTO / FRANCOIS GUILLOT (Photo credit should read FRANCOIS GUILLOT/AFP/Getty Images)
HOLLYWOOD, CA - DECEMBER 08: Actor Brad Pitt arrives at 'In the Land of Blood and Honey' premiere held at ArcLight Cinemas on December 8, 2011 in Hollywood, California. (Photo by Jason Merritt/Getty Images)
PALM SPRINGS, CA - JANUARY 07: Actor Brad Pitt accepts the Desert Palm Achievement Award onstage during The 23rd Annual Palm Springs International Film Festival Awards Gala at the Palm Springs Convention Center on January 7, 2012 in Palm Springs, California. (Photo by Michael Buckner/Getty Images For The Palm Springs International Film Festival)
LOS ANGELES, CA - JANUARY 29: Actors Brad Pitt and Angelina Jolie arrive at the 18th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 29, 2012 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
CANNES, FRANCE - MAY 22: Actor Dede Gardner and Brad Pitt pose at the 'Killing Them Softly' photocall during the 65th Annual Cannes Film Festival at Palais des Festivals on May 22, 2012 in Cannes, France. (Photo by Gareth Cattermole/Getty Images)
NEW YORK, NY - NOVEMBER 26: Actor Brad Pitt attends The Cinema Society with Men's Health and DeLeon hosted screening of The Weinstein Company's 'Killing Them Softly' on November 26, 2012 in New York City. (Photo by Stephen Lovekin/Getty Images)
Honoree Angelina Jolie (R) and actor Brad Pitt attend the 2013 Governors Awards, presented by the American Academy of Motion Picture Arts and Sciences (AMPAS), at the Grand Ballroom of the Hollywood and Highland Center in Hollywood, California, November 16, 2013. AFP PHOTO / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
LONDON, ENGLAND - FEBRUARY 16: Producer and actor Brad Pitt, winner of the Best Film award, poses in the winners room at the EE British Academy Film Awards 2014 at The Royal Opera House on February 16, 2014 in London, England. (Photo by Anthony Harvey/Getty Images)
Angelina Jolie and Brad Pitt arrive for the world premiere of Disney's 'Maleficent,' May 28, 2014, at El Capitan Theatre in Hollywood, California. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
Actor Brad Pitt and children Pax Jolie-Pitt (L), Shiloh Jolie-Pitt (C) and Maddox Jolie-Pitt arrive for the U.S. premiere of Universal Pictures 'Unbroken,' December 15, 2014 at the Dolby Theatre in Hollywood, California. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
PALM SPRINGS, CA - JANUARY 03: Actor Brad Pitt speaks onstage during the 26th Annual Palm Springs International Film Festival Awards Gala at Palm Springs Convention Center on January 3, 2015 in Palm Springs, California. (Photo by Jason Merritt/Getty Images for PSIFF)
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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:


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