Simple English definitions for legal terms
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A not-guilty plea is a formal response made by an accused person in court, denying that they committed the criminal offense they are charged with. The prosecution must then prove all elements of the charged offense beyond a reasonable doubt if the defendant is to be convicted.
For example, if someone is accused of stealing a car, they may enter a not-guilty plea, which means they are denying that they stole the car and the prosecution must prove that they did.
Other types of pleas include guilty plea, no-contest plea, and negotiated plea.