Forensic And Protocol On A Crime Scene Research

As referred to on - https://accessdl.state.al.us/AventaCourses/access_courses/forensic_sci_ua_v22/01_unit/01-03/01-03_learn_text.htm  

The 7 S's of a Crime Scene investigation are: 

- Secure the Scene:

This must be carried out by the first officer to arrive on the Scene, this includes making sure everyone around the area is safe and cutting off the area to preserve evidence. (Using crime scene tape) 

- Separate the Witnesses

By separating
 the witnesses it ensures that they don't talk, due to this enabling witnesses or the criminals themselves to come to a decision of what they are going to tell the officers, or in other words make up a 'cover story'.

- Scan the Scene

Here they'll identify where exactly the crime may have taken place, or places related to the crime.

- See the Scene 

The photography unit will take pictures of items identified during the initial scan, Photographs are taken here of the overall area, including closeups. They use evidence markers with numbers on.

- Sketch the Scene

A sketch is taken to highlight the crime scene, this is vital so if needed they can recreate the scene at a different location. ( including the date, time, location, date number, objects in the room , location of evidence etc.) 

- Search for Evidence

A search takes place to ensure nothing has been overlooked in the steps before.

- Secure and Collect Evidence 

placed in plastic bags and are then in the hands of the law, each person whom touches the evidence must complete a chain of custody. 

Crime Scene Key Facts 

Before any CSI steps foot on a crime scene they must wear a full set of extremely protective clothing, covering almost every inch of their body. ( Boot Covers, latex gloves a hood and a mouth guard.) By wearing this it makes it almost certain they will not contaminate the crime scene.

The first police officer that arrives on scene should set up a corder using tape, in order to protect all evidence within.

Officers must use a common approach path from the edge of the crime scene to the focal point. Usually stepping plates will be used within this region to keep the evidence safe.

The CSI must always be weary of environmental factors due to in some cases this compromising the evidence (rain, snow). In these cases the crime scene investigation may need to be done faster.