85.420—May I approve a transaction with an excluded or disqualified person at a lower tier?
         If a transaction at a lower tier is subject to your approval, you as an agency official may not approve—
    
    
        
        (a) 
         A covered transaction with a person who is currently excluded, unless you obtain an exception under  § 85.120; or
    
    
        
        (b) 
         A transaction with a person who is disqualified from that transaction, unless you obtain a waiver or exception under the statute, Executive order, or regulation that is the basis for the person's disqualification.