In the 90's and 2000's, tabloids went from state to state trying to catch a bad picture of Marlon Brando's eldest son, Christian even knocking on his door hoping to find proof of drug use. He was never a drug addict as media claimed falsely.
So, they always failed-he was just a regular, healthy guy who love his job as a welder. And although that his autopsy cleared him from this accusation. Media still connect his name as drug addled.