I recommend using a checklist to document everything you can about a crime scene.

In addition to creating an archive of the scene itself, this sort of report is a record that you actually observed everything you have noted. For example, say you are at a crime scene and there is no blood. Unless you actually note in writing that you saw no blood, how does one know you even looked for it? Assume you will be asked in court about everything. Once again, do everything possible to eliminate the questions.

Keeping a checklist…common sense? You bet. It’s your reminder to look at everything. It’s insurance that even if you get distracted, you will go back and you’ll be glad you opted for it once you’re questioned about the crime scene.

From: It's All in the Report! by Dick Warrington