Heaton was denied entry into the US and detained at LAX for cocaine possession.
The British actor was denied entry into the United States after authorities allegedly found cocaine on the 23-year-old when he arrived in Los Angeles.
The entertainment trade newspaper said Heaton admitted to law enforcement officials he had consumed the drug.
The 23-year-old, who was reportedly sent back to the United Kingdom, missed the Netflix show's season two premiere party on Thursday night, as his co-stars Millie Bobby Brown and Winona Ryder celebrated the release.
Stranger Things" star Charlie Heaton was deported from the USA over "cocaine bust'.
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It is unclear how long Heaton will be prevented from entering the United States.
According to People, Heaton was only detained - not arrested - before he had to return to the UK.
A statement obtained by People from the U.S. Customs and Border Protection says any foreign national may be inadmissible due to the commission of a crime involving drug possession.. But considering there was no arrest, nor is this exactly unusual with young actors, I'm betting on the story being forgotten fairly quickly with no real outcome.
Heaton has yet to comment publicly about the incident.
One Stranger Things star was celebrating the release of Season 2 on Netflix perhaps a little too hard this past week.