I see that a great many people visiting this blog are wondering whether the prosecutor can appeal Casey Anthony's acquittal on murder and manslaughter charges. No, they cannot. The Fifth Amendment to the U.S. Constitution provides a defendant with a range of protections, including the right to remain silent and protection against being retried following acquittal - protection against "double jeopardy":
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the Militia, when in actual service in time of War or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.
In rare cases, a defendant acquitted in state court might be subject to charges in federal court, typically on civil rights charges. That is most likely to happen when the defendant is a state actor, such as a police officer who has been acquitted in state court of a serious crime against a criminal suspect. I do not personally see a basis for bringing federal charges in this case, nor do I expect a federal prosecutor to be interested in attempting a new prosecution.
