A juvenile suspect or defendant must be separated from other suspects or defendants to avoid contact with them as much as possible.
少年の被疑者又は被告人は、他の被疑者又は被告人と分離して、なるべく、その接触を避けなければならない。
The proceedings against the juvenile defendant must be separated, even if related to other defendant cases, as long as the proceedings are not obstructed.
少年に対する被告事件は、他の被告事件と関連する場合にも、審理に妨げない限り、その手続を分離しなければならない。
At a penal institution, detention facility or coast guard detention facility, a juvenile, (other than a sentenced person as prescribed in Article 2, item (iv) of the Act on Penal Detention Facilities and the Treatment of Inmates and Detainees (Act No. 50 of 2005) (excluding any person with the status of detainee awaiting a judicial decision as prescribed in item (vii) of that Article)), must be detained separately from persons of 20 years of age or older.
刑事施設、留置施設及び海上保安留置施設においては、少年（刑事収容施設及び被収容者等の処遇に関する法律（平成十七年法律第五十号）第二条第四号の受刑者（同条第七号の未決拘禁者としての地位を有するものを除く。）を除く。）を二十歳以上の者と分離して収容しなければならない。
Read this with the articles around it
juvenile
「少年」
In this Act, a person under 20 years of age.
Defined inArticle 2, paragraph (1)· applies throughout the law