Good catch as he was detained. He was likely later interviewed (Interrogated), and eventually released without being formally arrested. His statements to the police, if any, are unknown at this time. He does currently have an attorney, which is a real smart move by anybody in his position.
The prosecutors and/or SPD either did not have enough probable cause to arrest, or did not think they could get a conviction at that time. That may or may not change as the state of Florida's investigating as well.
That is a very GOOD point too. This is still an open investigation. While the DA initially declined to file charges, if new and credible evidence or information is brought out which is adverse to Zimmerman's account, charges can still be filed.
If anyone saw my posts at the first FR featured story, I listed several forensic tests needed to be done regarding gun powder/shot residue on clothing, marks on knuckles, etc.
And then I said, “You do it by the book and your results will stand good in court” (paraphrased).
The comments about when an officer uses the Miranda rights is relevant too. A good catch.
Check the media from all sides and see if they have addressed these issues. I’m willing to bet that 98% of them either don’t know about forensics (I thought everyone watched CSI); don’t care to inquiry; or are afraid that the results (if known at present), will kill their biased reporting.
I learned about collecting evidence in a year-long course I took in both “Criminal Investigations” and “Criminal Law, Evidence and Procedure”. Basic investigative steps you take at a crime scene.
Also, collecting all the spent cartridges you can find; process the gun and clothing; residue powder check on hands as well as skin/DNA evidence under the nails, on the surface, etc.
You do it by the book.