Why Your LLM Probably Has a PII Problem (And How to Fix It)

Most teams building LLM applications think about prompt injection. Far fewer think about what happens when their users send sensitive personal data to their model. It's happening right now. Users paste credit card numbers into chatbots to ask billing questions. They share SSNs in healthcare chat interfaces. They drop email addresses and phone numbers into support bots without a second thought. That data hits your LLM, gets logged, potentially ends up in fine-tuning datasets, and almost certainly