A 24-year-old woman presents to the emergency department 18 hours after alleged rape by an unknown assailant. She reports vaginal pain and mild bleeding. On examination, there is a 2 cm laceration on the posterior vaginal wall with active bleeding, and bruising of the labia majora. Speculum examination reveals no cervical injury. The examining doctor collects forensic samples including vaginal swabs, blood, and saliva. Which of the following is the MOST appropriate next step in the medico-legal examination as per Indian guidelines?