Nothing in this chapter shall prohibit a person from filing a petition for release pursuant to this chapter. However, if a person has previously filed a petition for release without the approval of the Director of the Department of Mental Health and the court determined either upon review of the petition or following a hearing that the petitioner's petition was frivolous or that the petitioner's condition had not changed so that the petitioner was not safe to be at large and, if released, would commit acts of sexual violence, then the court shall deny the subsequent petition unless the petition contains facts upon which a court could find the condition of the petitioner had so changed that a hearing was warranted. Upon receipt of a first or subsequent petition from a committed person without the director's approval, the court shall, whenever possible, review the petition and determine if the petition is based upon frivolous grounds and, if so, shall deny the petition without a hearing.