May 30 (UPI) — An American academic facing up to 15 years in a Thai prison on allegations of insulting the monarchy has been permitted to leave the country, according to a nonprofit that advocates for Americans imprisoned abroad.

Global Reach told UPI in an emailed statement that Paul Chambers was permitted to leave Thailand on Thursday after resolving what it called “false” lese-majeste charges.

“I am relieved that this situation has been resolved,” Chambers said in a statement.

“I have always had great respect for the Thai royal family, and anyone who knows me understands that these charges were always based on false allegations by unnamed parties in the military.”

Chambers, a Thai studies scholar and lecturer at Thailand’s Naresuan University, was arrested and charged by Thai authorities in April following a complaint filed against him by the military over an October online post promoting a webinar that he was to participate in.

The English-language post was published on the website of Singapore’s ISEAS-Yusof Ishak Institute. The academic webinar was on Thai studies, and Chambers, a leading expert on the Thai military and Southeast Asian politics, gave a talk about the Thai military.

Chambers was not involved in the post’s creation.

According to Thai Lawyers for Human Rights, Chambers was allowed to leave the country after the Attorney General’s Office announced Wednesday that prosecutors decided not to continue the case against the American.

Prosecutors made the decision in early May, but the attorney general needed to affirm the decision.

Chambers was originally detained April 9, but was later permitted to leave police custody and was required to wear an ankle monitor and surrender his U.S. passport and work visa, Global Reach said.

Following his arrest, the U.S. State Department issued a statement saying it was monitoring Chambers’ situation while condemning the controversial lese-majeste law.

Kieran Ramsey, who worked with Chambers on behalf of Global Reach, praised the United States for its response to the case, saying, “This was one of the best responses I have ever seen from the U.S. government.”

According to Global Reach, Chambers will return to Oklahoma to see his family and will work from the United States.

More than 270 people have been detained, prosecuted and punished under the lese-majeste laws since 2020, according to an expert panel from United Nations that said such laws “have no place in a democratic country.”