I think that's more of a thing in civil cases, not criminal.  Prosecutors have to turn over any "Brady material" they have which is evidence the prosecution has that might show the defendant is innocent.  I don't think you get to do wide ranging discovery like have witnesses deposed like you do in a civil trial. https://en.wikipedia.org/wiki/Discovery_(law)#United_States  Discovery is also available in criminal cases.[8] Under the rule set forth in Brady v. Maryland, the prosecutor is obligated to provide to the defendant any information that is exculpatory or potentially exculpatory, without any request by the defense. Further discovery is available if initiated by the defendant. For example, a discovery demand might be for production of the names of witnesses, witness statements, information about evidence, a request for opportunity to inspect tangible evidence, and for any reports prepared by expert witnesses who will testify at trial.[9] If a defendant in a criminal case requests discovery from the prosecution, the prosecutor may request reciprocal discovery.[10] The prosecutor's right to discovery is deemed reciprocal as it arises from the defendant's request for discovery. The prosecutor's ability to obtain discovery is limited by the defendant's Fifth Amendment rights, specifically the defendant's constitutional protection against self-incrimination.