Final answer:
Specialized assistance at a crime scene may involve forensic scientists collecting and analyzing DNA samples, processing fingerprints, and other tasks requiring technical expertise. These scientists, often with at least a bachelor's degree, play a key role in law enforcement by providing critical evidence for court cases. so, option 2 is the correct answer.
Step-by-step explanation:
At a crime scene, specialized assistance may be required for several technical and expert tasks such as collecting evidence, analyzing DNA samples, processing fingerprints, and, though less technical, gathering witness statements could also benefit from specialized interview techniques. Specialists like forensic scientists perform detailed analyses of biological samples, use advanced DNA techniques, and provide vital information in courts. They are employed by government agencies' crime labs and must possess significant education, often at least a bachelor's degree in fields like chemistry, biology, or physics, with lab experience.
Forensic scientists use methods like polymerase chain reaction (PCR) to amplify DNA fragments for analysis. They compare DNA content from hair, semen, saliva, and blood against databases of DNA profiles from known criminals, besides other techniques like mitochondrial DNA sequencing. Their role is crucial in solving crimes and assisting law enforcement, which includes presenting findings in legal proceedings.