Law enforcement officials found traces of cocaine on him, and he admitted to using the drug, according to law enforcement officials who spoke to THR.
"Foreign nationals may be inadmissible due to the commission of a crime involving drug possession," said Jaime Ruiz, the branch chief of strategic media engagement for U.S. Customs and Border Protection. "CBP officers treat all international travelers with integrity, respect and professionalism while keeping the highest standards of security."
Heaton is a British citizen. He co-stars in the popular Netflix series Stranger Things as Jonathan Byers, the older brother of Will Byers who is at the heart of the series' mysteries. The second season of the show just premiered on Netflix.
The actor will also make his debut in the X-Men movie universe next year with The New Mutants, starring as Sam Guthrie AKA Cannonball.
That movie just saw its first trailer release earlier this month, promising a horrific take on Marvel's mutants and continuing 20th Century Fox's genre-shifting takes on the franchise.
Heaton's character was just showcased as part of a new motion poster for the film, showing a dead canary laying on a windowsill with the phrase "Some things can't be caged." That phrase and image references Cannonball's superpowers and his family's history in the mining industry.
The actor was not arrested, given the choice to revoke his application to enter the country and get back on a plane instead. However, it remains to be seen if he will suffer any consequences beyond this temporary denial.
Stranger Things 2 is now streaming on Netflix.
The New Mutants premieres in theaters on April 13, 2018.