Final answer:
Optional services some crime labs may offer include Toxicology Unit, Latent Fingerprint Unit, Polygraph Unit, Voice Print Analysis Unit, and Crime Scene Investigation Unit.
Step-by-step explanation:
Crime labs offer an array of services, among these, there are options such as a) Toxicology Unit, which deals with substances that may have caused harm to an individual b) Latent Fingerprint Unit, which analyzes prints left at a crime scene, and c) Polygraph Unit, where professionals use lie detectors to discern truths from falsehoods.
Some crime labs may also offer d) Voice print Analysis Unit, which analyzes audio evidence to identify speakers, and Crime Scene Investigation Unit, that collects and analyzes physical evidence from crime scenes. It's safe to say that e) All of the Above mentioned constitute the optional services which some crime labs may offer.
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