Warren County Commonwealth's Attorney, Chris Cohron, says a licensed psychologist found Jason Green incompetent to stand trial, but not incompetent enough to be committed to an institution.
As a result, Warren Circuit Judge John Grise had to dismiss the charges against Green.
Green had been charged with two counts of second degree arson and two counts of complicity to arson.
All four of the juveniles were 15 when they were arrested last June. Unless they are tried as adults, the outcome of their charges will remain confidential.