Guardrails for Amazon Bedrock enables you to implement safeguards for your generative AI applications based on your use cases and responsible AI policies. You can create multiple guardrails tailored to different use cases and apply them across multiple foundation models (FM), providing a consistent user experience and standardizing safety and privacy controls across generative AI applications.

Until now, Guardrails supported four policies — denied topics, content filters, sensitive information filters, and word filters. The Contextual grounding check policy (the latest one added at the time of writing) can detect and filter hallucination in model responses that are not grounded in enterprise data or are irrelevant to the users’ query.

https://dzone.com/articles/use-guardrails-to-prevent-hallucinations