CVS updated their policy. It’s actually not a change for most, since this is the policy CVS has been using, HOWEVER, it is NOW IN WRITING!
The additions in a nutshell:
You can use 2 coupons on a buy one get one free deal
You can use a buy one get one free coupon on a buy one get one free deal to get BOTH ITEMS FREE!
Check out the CVS POLICY.