; the rehabilitative potential of the juvenile within the juvenile system; and the best interest of the child ; (7) by striking leadership role and inserting juvenile’s level of participation in the offense ; (8) by striking in an organization, or otherwise influenced other persons to take part in criminal activities, involving the use or distribution of controlled substances or firearms. Such a factor, if found to exist, shall weigh in favor of a transfer to adult status, but the absence of this factor shall not preclude such a transfer ; (9) by striking juvenile, his parents and inserting juvenile, their parents ; and (10) by striking custodian and to his counsel and custodian and to their counsel . (c) Commitment Section 5039 of title 18, United States Code, is amended— (1) by striking or correctional institution in which he has regular contact with adults incarcerated because they have been convicted of a crime or are awaiting trial on criminal charges and inserting , correctional institution, or prison ; and (2) by striking near and insert near their . (d) Murder Section 1111 of title 18, United States Code, is amended by adding at the end the following new subsection: (d) A person who was under the age of 18 at the time of the perpetration or attempted perpetration of a crime listed under subsection (a) in which the death of a human being occurs is liable for murder only if one of the following is proven: (1) the person who intentionally or knowingly causes the death of another person