2 C.F.R. § 180.430
How do I check to see if a person is excluded or disqualified?
You check to see if a person is excluded or disqualified in two ways:
(a) As a Federal agency official, you must check SAM.gov Exclusions when you take any action listed in § 180.425.
(b) You must review the information that a participant gives you, as required by § 180.335, about its status or the status of the principals of a transaction.