What are the steps in collecting evidence at a crime scene?

When collecting evidence at a crime scene in the USA, there are several crucial steps to follow. First, secure the area to prevent contamination. Next, document the scene through photography and sketches. Then, collect and package the physical evidence using proper techniques. It's important to label and seal all evidence to maintain integrity. Finally, ensure that the evidence is transported and stored appropriately. These steps are essential for Grade 7 students learning about Crime Scene Investigation and Evidence Collection in their Science class.