The Federal Judge that is reviewing the CVS-Aetna ruled that there is no need for a court monitor to be appointed to oversee that the CVS and Aetna businesses remain separated while the merger is under review, and agreed on the implementation of four steps that have the task of ensuring that the business don't merge until the completion of the review.
https://www.healthcarefinancenews.com/news/cvs-and-aetna-judge-agrees-4-steps-keep-retail-pharmacy-and-pbm-separate-during-merger-review