This type investigation is deeper, preserving evidence and measurements on accident scenes, vehicles, interviewing police officers and when needed taking recorded statements from from witnesses including drivers.

Full or limited to specific issues.  Analyze the evidence, applying appropriate science.  Includes drawing scale diagrams, can include computer analysis and animation as needed on how the accident happened.  Speed analysis by computer contributing factors to the accident.

Analyze furnished data and testimony.  Limited or applying science and procedures above, as needed.

General investigation and photos of accident scene, vehicles, interview police officers and take recorded statements of witnesses and drivers.