Question

The _______________ ______________ is a rather superficial on-site assessment and collection of evidentiary details observed by the first responding officer(s) and relayed by witnesses.

Answer 1

,I believe the answer is: preliminary investigation
preliminary investigation refers to the process of determining whether there is a reason to believe a crime has been done.
In order to do this,the police department would look sign of crimes in the report. strong signs would include things such as sound of gun shot, broken window/lock, pool of blood, etc.