Monserrate supported the New York Rescue Workers Detoxification Project, a project co-founded by Tom Cruise to deliver the so-called Purification Rundown (an unproven "detoxification" procedure created by L. Ron Hubbard as part of Scientology) to rescue workers affected by the September 11 attacks. Monserrate went through the program himself, and drafted official proclamations honoring both Cruise and Hubbard. He also attended a fund-raising dinner in New York for the project, as well as an event at the Scientology Celebrity Centre in Los Angeles. Monserrate dismissed medical authorities' criticism of the Purification Rundown, saying, "This is the same type of thing they said about chiropractors twenty years ago."