The first step in collecting a firearm from a crime scene is what?

The correct answer would be ensuring safety as first step.

Safety should always be the first consideration when in a crime scene, before taking any evidence, or any photos.

Once there's confirmation regarding safety of the area, they can proceed with the other protocols.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

answer: sure

explanation: i'd love to know everything but that burden is too much to bare.