The actor son of Hollywood veterans Sean Penn and Robin Wright was arrested for drug possession in Nebraska this week, according to a report.
Hopper Penn, 24, was pulled over Wednesday while driving in a car with actress Uma von Wittkamp in the Cornhusker State, according to TMZ.com.
During the traffic stop for failing to signal, the officer reportedly detected drug activity and decided there was probable cause to search.
Police found 14 grams of marijuana, four amphetamine pills and three grams of mushrooms, the website said.
Penn reportedly was booked for the mushrooms and less than an ounce of marijuana while his companion was booked for the pills and mushrooms.
Hopper has spoken publicly about his struggles with substance abuse in the past.
In an interview with ES magazine last year, he said that after his parents' breakup and a serious skateboarding accident, he fell in with the "wrong crowd."
"I was doing a lot of stuff, but meth was the main one that brought me down. I went to rehab because I woke up in hospital and my dad said, 'Rehab? Or bus bench?' I was like, 'I'll take the bed,'" Penn said.
"Thank God I got out of that because that was the worst time in my life. Because it's not fun when it gets to a point where you just need it," he said.
RELATED: Sean Penn and his son, Hopper Jack Penn
Sean Penn and his son, Hopper Jack Penn
Sean Penn and his son, Hopper Jack Penn
BEVERLY HILLS, CA - DECEMBER 3: Actor Sean Penn and son Hopper attend the 'I Am Sam' Beverly Hills Premiere on December 3, 2001 at Academy of Motion Picture Arts & Sciences in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
404402 09: Actor Sean Penn spends the day shopping with his daughter, Dylan Frances (L) and son Hopper Jack on Sunset Plaza April 23, 2002 in Hollywood, CA. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, UNITED STATES: US actor Sean Penn (L) arrives with his son Hopper at the premiere of 'Dogtown and Z-Boys,' which he narrated, 23 April 2002 in Los Angeles, CA. The film is a documentary feature on the birth of modern skateboarding. AFP PHOTO/Lucy Nicholson (Photo credit should read LUCY NICHOLSON/AFP/Getty Images)
Sean Penn, Hopper Jack Penn, Dylan Frances Penn and Robin Wright Penn (Photo by James Devaney/WireImage)
Sean Penn and Jack Hopper Penn during Celebrities Attend Atlanta Hawks vs. New York Knicks Game at Madison Square Garden in New York City, New York, United States. (Photo by James Devaney/WireImage)
ANTIBES, FRANCE - MAY 19: (EXCLUSIVE COVERAGE) Sean Penn and Hopper Penn attends amfAR's Cinema Against AIDS Gala during the 64th Annual Cannes Film Festival at Hotel Du Cap on May 19, 2011 in Antibes, France. (Photo by Andrew H. Walker/amfAR11/Getty Images for amfAR)
CANNES, FRANCE - MAY 20: Sean Penn and son Hopper Penn attend the 'This Must Be The Place' Premiere during the 64th Cannes Film Festival at the Palais des Festivals on May 20, 2011 in Cannes, France. (Photo by Tony Barson/WireImage)
LOS ANGELES, CA - MAY 07: Hopper Jack Penn and Sean Penn are seen in Hollywood on May 07, 2015 in Los Angeles, California. (Photo by RB/Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 13: Actor Hopper Penn (L) and Uma Von Wittkamp attend the launch of the Parker Institute for Cancer Immunotherapy, an unprecedented collaboration between the country's leading immunologists and cancer centers on April 13, 2016 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for Parker Media)
(FromL) US actor Hopper Penn, French actress Adele Exarchopoulos and US actor and director Sean Penn pose as they arrive on May 20, 2016 for the screening of the film 'The Last Face' at the 69th Cannes Film Festival in Cannes, southern France. / AFP / LOIC VENANCE (Photo credit should read LOIC VENANCE/AFP/Getty Images)
South African-US actress Charlize Theron and US director Sean Penn's son Hopper Jack Pennposea s they arrive on May 20, 2016 for the screening of the film 'The Last Face' at the 69th Cannes Film Festival in Cannes, southern France. / AFP / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)
CANNES, FRANCE - MAY 20: Hopper Penn, Director Sean Penn and Dylan Penn attend 'The Last Face' Premiere during the 69th annual Cannes Film Festival at the Palais des Festivals on May 20, 2016 in Cannes, France. (Photo by Laurent Viteur/FilmMagic)
CANNES, FRANCE - MAY 20: Javier Bardem, Hopper Jack Penn, Adele Exarchopoulos and Sean Penn attend a screening of 'The Last Face' at the annual 69th Cannes Film Festival at Palais des Festivals on May 20, 2016 in Cannes, France. (Photo by Tony Barson/FilmMagic)
CANNES, FRANCE - MAY 20: Hopper Penn and his father director Sean Penn attend 'The Last Face' Premiere during the 69th annual Cannes Film Festival at the Palais des Festivals on May 20, 2016 in Cannes, France. (Photo by Foc Kan/FilmMagic)'n'n'n'n'n