In this context, the prosecutor is the public authority that can approve or deny real-time biometric recognition for law-enforcement use. “PM” is the common abbreviation for pubblico ministero, the public prosecutor in Italy.
This role matters because live facial recognition is a high-impact surveillance tool: it can identify people in public spaces as events unfold, so access must be tightly controlled. The prosecutor acts as a legal gatekeeper, checking necessity, proportionality, scope, and duration before activation. That reduces the risk of routine mass surveillance.
In practice, the term appears in authorization workflows, not in the matching algorithm itself. Defenders need to secure the surrounding process: who can request activation, who can load a watch-list, who receives alerts, and how logs are audited. Attackers or insiders may try to bypass that oversight by using weak approvals, overbroad requests, or poor recordkeeping.