The State must establish and implement effective procedures for investigating and resolving suspected and apparent instances of fraud and abuse. Once the State determines that a full investigation is warranted, the State must implement procedures including, but not limited to the following:

(a) Cooperate with and refer potential fraud and abuse cases to the State program integrity unit, if such a unit exists.

(b) Conduct a full investigation.

(c) Refer the fraud and abuse case to appropriate law enforcement officials.