Is it true that a spouse needs to be a Power of Attorney to remove his wife into another rehab facility? Medical or Durable Power of Atty or both?

My friend, the husband, had to place his wife after her operation into a nursing/rehab facility for short term purposes only. Since then, he has discovered that she is not getting the quality of physical therapy that is needed in order for her to be well enough to come home. He would like to move her to another facility since she isn't getting the care that is needed. He was told that he could not move her since he is not her Power of Attorney. I wanted to confirm that this is true and what kind of Power of Attorney does he need to get, Medical or Durable Power of Attorney or both? Thank you!