Final answer:
Ethanol and paternity tests exemplify the 'chain of custody', ensuring that the evidence is properly managed from collection to court presentation.
Step-by-step explanation:
The terms ethanol and paternity in the context of your question relate to different aspects of forensic science and legal procedures. Ethanol is often associated with blood alcohol testing, while paternity relates to determining the father of a child through DNA testing. When referring to how these samples are managed, they are examples of chain of custody. This term refers to the documented and unbroken transfer of evidence from the time it is collected until it is presented in court, ensuring that samples are not tampered with or contaminated, thereby preserving their integrity.