Campaign groups behind the controversial suicide capsule, “Sarco,” have suspended applications following a criminal investigation into its first use.

A 64-year-old woman from the U.S. became the first to use the device on Sept. 23 in Switzerland, prompting intense public and legal scrutiny.

The president of The Last Resort, Florian Willet, is in pretrial detention, and Swiss authorities are investigating the case, as reported by News Week.

Despite Switzerland’s permissive assisted suicide laws, Sarco’s legality is under question. Over 370 people had applied to use the device before the process was halted.

Written by Emily Begley