Step-by-step explanation:
The answer is B. the forensic scientist's opinion of what happened at the crime scene.
Forensic scientists should not include their opinion of what happened at the crime scene on the label of a drug found there, as this is not a factual piece of information that can be determined by scientific analysis. The label should include where the drug was found, the condition of the drug when it was found, and the results of any presumptive drug tests done at the scene, as these are all objective pieces of information that can be used in the investigation and prosecution of the crime.