Nevada says it's looking into whether cryotherapy is safe for the general public after the death of a Las Vegas spa worker found inside a treatment chamber chilled by liquid nitrogen.
The state says it's shifting its investigation beyond employee safety and the equipment used in the treatments to the technology itself.
The state's Division of Industrial Relations administrator, Steve George, said Monday that the change could lead to regulations for the industry.
The use of whole body cryotherapy has been growing across the country but the unproven treatments that involve subjecting the body to extreme subzero temperatures have largely been unregulated worldwide.
Employees at Rejuvenice in Henderson, Nevada, found the body of manager Chelsea Ake, 24, inside one of the ice machines late last month.