1. Forensic Science Programme, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
2. Department of Chemistry Malaysia (Kelantan Branch, Kota Bharu, Kelantan, Malaysia
3. Narcotics Division, Forensic Science Analysis Centre, Department of Chemistry Malaysia (Headquarter), Petaling Jaya, Selangor, Malaysia