Answers · CMMC & AI compliance
Can defense contractors use ChatGPT?
Yes, defense contractors can use ChatGPT — but only if Controlled Unclassified Information (CUI) is scanned and blocked locally before prompts leave the network. Pasting CUI directly into ChatGPT transmits it to OpenAI, which is a reportable DFARS 252.204-7012 spill. A local-only AI firewall lets teams use ChatGPT while keeping CUI inside the boundary.
Why pasting CUI into ChatGPT is a violation
DFARS 252.204-7012 requires contractors to protect CUI on systems authorized to hold it. ChatGPT's servers are not such a system. The moment an employee pastes a CAGE code, a contract number, ITAR-controlled specs, or clearance data into ChatGPT, that information has left your covered system and reached a third party — a security incident you may be required to report within 72 hours.
This is not hypothetical: it's the most common way AI adoption breaks CMMC Level 2, because it happens silently, thousands of times, with no log.
The catch with “AI DLP” tools
The instinct is to add a data-loss-prevention (DLP) tool. But most AI DLP products (for example Nightfall and Strac) are cloud-based — to scan your prompt, they first transmit it to their cloud. For a defense contractor, that transmission is itself a CUI exposure. You can't solve a DFARS 7012 problem with a tool that creates a DFARS 7012 problem.
How to use ChatGPT compliantly
The only architecture that works is local-only: scan the prompt on your own hardware, before it leaves, and block anything containing CUI.
- Put an OpenAI-compatible proxy (such as HoundShield) in front of ChatGPT, Copilot, Claude, or Cursor — one base-URL change.
- Every prompt is inspected on your hardware in under 10ms; CUI, CAGE codes, and clearance data are blocked or quarantined.
- Clean prompts pass through untouched, so your team keeps working.
- Every decision is written to a SHA-256 signed audit log you can hand to your C3PAO.
FAQ
Frequently asked questions
Use AI without leaking CUI
HoundShield scans every AI prompt locally and blocks CUI before it leaves your network. One URL change. Under 10 minutes. C3PAO-ready.