They aren't releasing all the evidence that the grand jury was given. They would have been shown the autopsy results, which likely showed that Garner's death was more due to existing conditions than the actions of the officer. The only way to prevent this in the future would be for officers to do nothing and let criminals go free or for suspects to call a time out to inform them that they have health issues. Can't really see that happening. Clearly, that is not the solution. The best way to prevent this sort of thing would be for criminals to change their ways and for anyone confronted by police to fully cooperate. Of course, that won't happen because they don't want to get caught. Seems to me that if you are in bad health, or not, and decide to fight police, the choice was completely yours and you should bear responsibility for the consequences. The choke hold is not banned, as some claim, and this case proves that physical exertion is a very bad idea for those with heart conditions. Garner made a very stupid choice to start fighting. Sad that it cost him his life, but it was his choice.
Bottom line is that the officer used an approved method for constraining a combative suspect and had no idea that it would end that way due to the guy's health.
From the link:
"Pataleo's lawyer and police union officials argued that the grand jury got it right, saying that the officer used an authorized takedown move — not a banned chokehold — against a man who was resisting arrest. And they said Garner's poor health was the main cause of his death.
To find Pantaleo criminally negligent, the grand jury would have had to determine he knew there was a "substantial risk" that Garner would die.
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http://news.yahoo.com/chokehold-decision-highlights-complex-jury-process-062504221.html