She fired warning shots inside her own home to avoid beating from abusive husband whom she had protection order against. 20 years is an extreme sentence, if any sentence should be imposed to begin with.

Here is the story: http://www.cbsnews.com/8301-201_162-57433184/fla-mom-gets-20-years-for-firing-warning-shots/ 

And another: http://www.huffingtonpost.com/2012/05/11/marissa-alexander-sentenced_n_1510113.html?show_comment_id=154177546#comment_154177546

The law may be correct as presented here:http://www.scribd.com/doc/89763383/States-Motion-in-Opposition-of-Defendants-Motion-for-Immunity but 20 years?

 http://jacksonville.com/news/crime/2012-05-11/story/jacksonville-woman-sentenced-20-years-prison-stand-your-ground?page=1#comment-587872​

http://usnews.msnbc.msn.com/_news/2012/05/11/11660804-marissa-alexander-gets-20-years-for-firing-warning-shot-after-stand-your-ground-defense-fails?threadId=3416514&commentId=65876878#c65876878​

http://articles.cnn.com/2012-05-11/justice/justice_florida-stand-ground-sentencing_1_warning-shot-emotional-sentencing-hearing-florida-woman?_s=PM:JUSTICE