How does human development explain the juvenile's separate legal treatment?

The investigation's juvenile face: the specialised police units (the Women-and-Children Service Centres and the directorate's line — the trained investigators); the child-friendly inquiry discipline of the Juvenile Justice (Procedure) Rules 2063 — the questioning in a suitable environment, limited in stretch (not more than an hour at a sitting, never at night), the parent's-or-guardian's-or-social-worker's presence, no coercion (the confession's juvenile fragility — Unit 1.3's suggestibility), no handcuffs-or-uniform display, the custody separated from adults; the age determination (the birth registration, the school records, and where they fail — the ossification-and-dental-bone examination practice, the trafficking-victim's misaging disputes); the FIR-and-investigation's speed discipline; and the diversion's police-level face (the minor offence's warning-and-release-and-family-referral route — the Children's Act 2075's discipline).