As the collection of physical evidence begins:

1. the police chief has primary responsibility of maintaining the chain of custody
2. the medical examiner should oversee the collection of the evidence at the crime scene
3. the district attorney should be consulted for admissibility of the physical evidence in court
4. all observations should be recorded through photographs sketches and notes

تمام مشاہدات کو فوٹو خاکوں اور نوٹ کے ذریعے ریکارڈ کیا جانا چاہئے ، جیسے ہی جسمانی شواہد کا جمع ہونا شروع ہوتا ہے