Fortunately I have never been knocked on my melon hard enough to cause a concussion. So I guess I wouldn't know from personal experience wether that would affect my memory.
The standard procedure used when a copper talks to a suspect in the hospital is to talk to the doctor first to ascertaain whether or not the suspect is capable of giving a knowing, voluntary statement. The doctor is capable of determining whether the person is under the influence of medication or if an injury is severe enough to hinder the person.
If the conviction was based on the confession, any reasonable defense attorney would have filed a motion to supress it, and the judge would hold a hearing settle the matter.
As there are different degrees of injury, there would also be different degrees of coherence, and simply because someone is in the hospital does not mean that they cannot talk to the police.
No Miranda warnings were required if the guy wasn't in custody.
Police can tape any conversation they participate in whether the suspect is aware of it or not. That is really a moot point anyway since the cop was probably writing down everything the guy said, in essence "recording" his statement.
Police can take a statement from a person without a lawyer present, unless of course a person asks for one. And parent need not be present during the interview.
None of this has anything to do with the guy's actual innocence or guilt since I still don't know the particulars of this case, but I fail to see anything thus far that would cause the confession to be thrown out.
With regards to the statement that he may be guilty, but how many of us have gone too fast and out of control . . . Many of us may have, but that would be reckless, and when a person's recklessness causes a death it becomes a criminal offense.
Apply the same logic to guns. Well I was dry-firing and didn't check to make sure the gun was unloaded first because I always unload my guns, and I was pointing the gun through my window at a tree accross the street, and pulled the trigger expecting it to go click, but it went bang instead and somebody driving by was shot and killed. What's the big deal? So I violated a couple of basic safety rules, who hasn't? I shouldn't be charged just because the guy died, after all, you drive a car at your own risk.
Uh, no.