Prince Harry did tell US authorities about his drug use when he applied for his visa to live in California, it was suggested last night.
Visa applicants are required to tick a box to answer "yes’" or "no" to the question: "Are you or have you ever been a drug abuser or addict?"
Harry has openly admitted to using a variety of substances in the past, including marijuana, cocaine and magic mushrooms.
In his best-selling memoir, Spare, the royal recalled using psychedelic drugs.
He also admitted to hallucinating during a celebrity-filled event in California and smoking cannabis after his first date with Meghan.
The duke reaffirmed the drug usage last month while taking part in a therapy session with toxic trauma expert Dr Gabor Mate.
The drugs he took included the hallucinogenic Amazonian plant ayahuasca, which supposedly has the effect of "removing life’s filters".
Sources close to the Duke of Sussex told The Telegraph that Harry had been truthful on his visa application, indicating that he did disclose his drug history.
However, admission of drug use usually results in visa applications being denied.
It comes after a Freedom of Information (FoI) request was filed by a leading US think tank who are asking the Duke to be "totally transparent" about his answers. The deadline for a response is April 12.
In 2019, Brit Isabella Brazier-Jones claimed she was banned from the USA for 10 years after admitting to snorting a line of cocaine two years prior.
The 31-year-old said she was immediately thrown in a jail cell and made to wait for 24 hours before being shipped back to Britain.
A ban is sometimes overturned following an in-person interview at a US consulate or official immigration office, where a waiver can be issued.
Samuel Dewey, a lawyer acting for America's Heritage Foundation in its FoI case, said: “One condition of a waiver in the case of someone who has admitted drug use could be that the person has to check back with the medical examiner, so that there is some sort of follow-up.
“But we just don’t know how Prince Harry has been treated and that is why we are asking these questions."
The Heritage Foundation previously called for Harry's visa application to be released so the US taxpayer can understand whether the royal declared his drug use.
The conservative think tank's director Mike Howell said: “This request is in the public interest in light of the potential revocation of Prince Harry ’s visa for illicit substance use and further questions regarding the Prince’s drug use and whether he was properly vetted before entering the United States”.
The Heritage Foundation argues if immigration officials did know about the royal's drug use, Harry's case raises questions over whether he was given special treatment because he is a prince and his wife is a TV star, which they insist would be illegal.
In response to the Foundation’s calls, a US State Department spokesman said: "Visa records are confidential under Section 222(f) of the Immigration and Nationality Act (INA); therefore, we cannot discuss the details of individual visa cases."
