Thats what I was thinking too. Whatever hospital did not admit him really missed the boat on thus, IMO.
According to article his parents brought him back to the dorm.
A 19-year-old student suspected of killing his parents at a Central Michigan University dormitory had been acting so strangely the day before that campus police called his mother and then took him to a hospital for suspected drug abuse, authorities say.
Central Michigan University police Chief Bill Yeagley told reporters that James Eric Davis Jr's parents had just picked him up from the hospital and brought him to his dorm to pack up when the shooting happened on Friday.
http://www.theherald.com.au/story/5262392/man-19-used-dads-gun-in-campus-shooting/?cs=5