I need help answering the following question. My answer to this post needs to be substantial and detailed. Thanks

Maureen Frugali was a training supervisor for claims processing at Colossal Healthcare. As a standard part of the claims processing training program, Maureen created fictitious claims for use by trainees. These fictitious claims were then sent to the accounts payable department. After the training claims had been processed, she was to notify Accounts Payable of all fictitious claims, so that they would not be paid. However, she did not inform Accounts Payable about every fictitious claim. She created some fictitious claims for entities that she controlled (that is, she would receive the payment), and she let Accounts Payable pay her.

What is the control that is missing control and what should be implemented to address?