Despite more than fifty controlled studies by 2005 showing facilitators, not the person being facilitated, controlled the typed messages, and the American Psychological Association stating in 1994 there was no scientifically demonstrated support for the technique, some practitioners and family members continued to use and defend it for years afterward. The sources consulted here do not settle how much of that persistence reflects genuine belief formed from specific favorable cases versus institutional and emotional investment that made abandoning the technique difficult.
What would resolve this A study of practitioner and family decision-making that traces why individual cases and institutions continued after the aggregate controlled evidence became clear, rather than only re-testing whether the technique itself produces authentic communication.
OpenHistory and sociology of science, clinical psychologyWikipedia: Facilitated Communication