Heaton was detained last October at LAX Airport after a law enforcement source told ET the actor possessed small traces of cocaine.
In an interview with Flaunt Magazine, the actor was very candid when talking about this incident.
"It was f**king bad. It was just terrible", he admits, adding that he's now allowed to enter the country.
A premiere date has not been announced for the third season of "Stranger Things", which has faced controversy in recent days after a pair of female staff members complained about the environment on set.
Speaking to Flaunt magazine, he revealed that although his future on the Netflix show was in doubt, he is now allowed to enter the United States to work and will return next month for filming on season three: 'At the end of the day I just wanted to go back.
"It was hard. Everything happened so fast, and I hadn't come to terms with the fact that I was famous", the actor explained.
"When something steps in from the work you are doing and breaks into your personal life. you feel kind of vulnerable", Heaton describes.
The Yorkshire-born actor says that the experience was hard, especially when the press hounded his home and his parents' residence.
Regarding the production of Season 3 of Stranger Things, the actor says that there's no issue regarding his eligibility to work in the US. All of a sudden it becomes a very big story and it gets really blown out of proportion'. "'I want to work and continue to work-that's all I've ever done".
'I do want to clarify that I was not arrested or charged with a crime, and cooperated fully with the US officials at LAX.