455.16—Resolution of full investigation.
         A full investigation must continue until—
    
    
    
        
        (b) 
         The case is closed or dropped because of insufficient evidence to support the allegations of fraud or abuse; or
    
    
        
        (c) 
         The matter is resolved between the agency and the provider or recipient. This resolution may include but is not limited to—
    
    
        
        (1) 
         Sending a warning letter to the provider or recipient, giving notice that continuation of the activity in question will result in further action;
    
    
    
    
    [43 FR 45262, Sept. 29, 1978, as amended at 48 FR 3756, Jan. 27, 1983]