What happens when OFAC screening fails

A missed screening check means an undetected violation, possible enforcement exposure, and a scramble to remediate after the fact.

TL;DR

TL;DR: When screening fails, a blocked counterparty can transact unnoticed, and because OFAC uses strict liability, the lack of intent does not protect you from civil penalties.

The immediate consequence

If a screening call fails silently and your code defaults to allow, a wallet or name on the SDN List can pass through your system. OFAC's Office of Foreign Assets Control enforces the SDN List with strict liability, meaning a violation can be found even when no one meant to break the rules.

The enforcement exposure

Civil penalties start at $356,000 per violation. The 50 Percent Rule widens the risk, because entities 50 percent or more owned by a blocked person are also treated as blocked. One undetected counterparty can therefore represent multiple violations.

The path to remediation

The fix is to make screening a hard gate that fails closed. Use a screening API that returns clean or flagged in one HTTP call under 100 ms, and log every result. SanctionsAI exposes tools like sanctions_check and risk_score so the check is explicit and auditable, rather than an afterthought.