CORONIAL LAW - cause and manner of death - cardiac arrhythmia - Torsades de Pointes - medical prescription of methadone (Physeptone tablets) - appropriateness of dosage, induction rate and medical supervision of methadone prescription - application to Pharmaceutical Services Unit ("PSU")/ Pharmaceutical Regulatory Unit ("PRU") for authority to prescribe methadone; responsibilities, objectives, functions and policies of the PSU/PRU - referral pursuant to Health Practitioner Regulation National Law(NSW)