In January 2022, the
issued an interim assessment concluding that the syndrome is not the result of "a sustained global campaign by a hostile power". Foreign involvement was ruled out in 976 cases of the 1,000 reviewed.
In February 2022, a panel of experts assembled by the Biden administration released an executive summary stating that stress or psychosomatic reactions could not explain some of the incidents of Havana syndrome it had reviewed, and that radio waves could have caused some of the injuries of the CIA officers and diplomats.
At roughly the same time, the State Department commissioned the
to investigate the cause. In February 2022, the State Department released the JASON report, which stated that it was unlikely that a directed energy attack had caused the health incidents.
In March 2023, seven U.S. intelligence agencies completed a review of the proposed cases of Havana syndrome and released an unclassified report with the consensus that "available intelligence consistently points against the involvement of US adversaries in causing the reported incidents" and that a foreign adversary's involvement was "very unlikely".
Despite this report,
-funded experiments which attempted to recreate Havana syndrome in animals by exposing them to
waves for extended periods continued.
