9.3.1 Observe visitors to verify the use of visitor ID badges. Attempt to gain access to the data center to verify that a visitor ID badge does not permit unescorted access to physical areas that store cardholder data
[PCI DSS 1.x] 9.3.1 Authorized before entering areas where cardholder data is processed or maintained
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[RETIRED] PCI DSS v.1.x Questions and Answers
Implement Strong Access Control Measures