Why is it important to pick up a firearm at a crime scene by the edges of the trigger guard or the checkered part of the grip?

It's important to pick up a firearm at a crime scene by the edges of the trigger guard or the checkered part of the grip to prevent contamination of evidence and avoid accidental discharge. Handling the firearm in these areas minimizes contact with critical surfaces that may hold fingerprints or other trace evidence. This careful approach also helps maintain the integrity of the investigation by ensuring that the firearm remains in as close to its original state as possible for forensic analysis.