Site Conditions

Each investigation should be conducted as soon after the incident as possible. A delay of only a few hours may permit important evidence to be destroyed or removed either intentionally or unintentionally. Before objects are moved, cleaned, or removed, the investigator should record the scene of the incident as it was at the time of the accident.

Photos

Take photos of the site from all angles, as well as up close and from a distance.

• Take photos of the general area.
• Take close-up photos of any detail which may be important, such as tools, machinery, work area conditions, site orientation, control panel positions, work flow patterns, etc. 
• It may be helpful to place an object, such as a ruler or pencil, of known size into the picture to show proportion. 
• Be sure you know how to use the camera beforehand; learning to use it during a critical incident may cost you valuable evidence. 
• If possible, make sure the date and time stamp feature is turned on for investigative purposes.

Drawings/Sketches

It may be necessary to make a sketch of the area layout for future reference, or building floor plans may be available.

• Use a tape measure to note the actual distances between objects for exact reference.
• Remember to include vertical measurements as well as horizontal. 
• Check the entire area (ceiling, walls, equipment, and floor) for signs of damage or disturbance, or which may in any way be related to the incident.