In collaboration with Teleport, Doyensec has developed the Security Policy Evaluation Framework (SPEF) — a dynamic testing and benchmarking tool for evaluating the security, performance, and reliability of popular authorization policy engines like Rego, Cedar, OpenFGA, and Teleport ACD. Built with modular architecture and containerized execution, SPEF allows researchers and engineers to validate policies under consistent, controlled conditions. This article walks through its architecture, supported engines, and key insights from early testing across 27 threat-driven test cases.