The reason is that Terri's parents could sue the Hospice.
Really? How? They have no proof. (Judge GREER authorized and allowed PREPAYMENT out of TERRI's REHAB MONEY, Terri's CREMATION, so there will be no EVIDENCE to be found from an autopsy).
They are not allowed in to see Terri, except by Michael's permission, and the Hospice staff that is still there, has already been ordered to keep quiet.
Maybe their lawyer could look into it. However, I doubt it.