By Kristen Walsch The Patriot Ledger It's not often you see a State Police cruiser escorting an ambulance to bring someone home. For Sandy, a year-old harbor porpoise, it was first-class all the way as she was released in the waters off Gloucester on Wednesday night. Sandy was rescued March 5 by the Cape Cod Stranding Network on a beach in Barnstable. She was taken to a New England Aquarium facility off the Duxbury coast, and for the past four months she was given around-the-clock care by the aquarium's team of veterinarians, biologists and volunteers. Undernourished, ridden with parasites and with a touch of pneumonia, the porpoise was watched by team members at her indoor holding pool 24 hours a day until she began eating on her own. After Sandy gained nearly 20 pounds and was cleared medically, the aquarium staff set the plans in motion toward her release. As members of the rehab team began giving her live fish, she became increasingly active. "She started to swim faster around...