Prosecutors say Forsyth on April 27 and May 29 called Health South Rehabilitation Hospital in Texarkana and made a false bomb threat. Investigators say Forsyth created a note, which he pretended to find May 29 at the hospital, critical of a woman's treatment.
Law officers on May 30 located a fake explosive device made by Forsyth and left at the hospital.
Patients had to be evacuated twice.
No sentencing date was immediately set.
