What should the system that retrieves criminal history records not be used as?

The retrieval system for criminal history records is specifically designed to provide accurate and reliable information about an individual's criminal background; however, it is not appropriate to use it as a substitute for comprehensive investigations or as the sole basis for critical decisions. This is because the system may not contain all relevant information, such as pending cases or local records, and it is essential for law enforcement and other entities to conduct thorough investigative processes that incorporate multiple sources of information. Using the system as a substitute could lead to incomplete assessments and potentially detrimental outcomes.

In contrast, options such as "replacement," "contextual reference," or "support system" denote functions where the criminal history database might serve as an adequate source of information to supplement investigation efforts without being the single source upon which decisions are made. Thus, while the system can provide valuable insights, it's crucial to understand its limitations and not rely on it exclusively, which is why "substitute" is the correct answer.