A 24-year-old woman presents to the emergency department 18 hours after alleged sexual assault. She reports vaginal pain and mild bleeding. On examination, there are multiple abrasions on the inner thighs and a 2 cm laceration of the posterior fourchette. A high vaginal swab is taken for DNA analysis. The examining doctor notes that the hymen is intact but shows recent tears at the 6 o'clock position. According to IPC sections and standard medico-legal protocol, which of the following is the MOST appropriate next step in documentation and evidence collection?