"Discovery is the process through which defendants find out from the prosecution as much as they can about the prosecution's case. For example, through standard discovery techniques, the defendant can:
(1) Get copies of the arresting officers' reports and statements made by prosecution witnesses; and
(2) Examine evidence that the prosecution proposes to introduce at trial.
Traditionally, the prosecutor was not entitled to information held by the defendant. But in recent years discovery has become more of a two-way street. Just as defendants can discover information from prosecutors, so too can prosecutors examine certain evidence in the hands of defendants." -From, "The Criminal Law Handbook" By: Bergman & Berman-Barrett