A non-party cannot typically obtain such discovery documentation, though it could potentially be available in certain circumstances, depending on your purpose and your relation to the matter.
Discovery is rarely, if ever, kept at the courthouse or in the courthouse files, but rather with the parties themselves and/or their attorneys. As you might expect, most such requests to either parties or their counsel will likely go ignored.
If you found this answer helpful, please click the "Mark as good answer" button, below. If you'd like to contact me regarding potentially representing you with regards to your legal matter, please click on my profile and give my office a call. My answer to your Avvo question, however, is informational only and is not intended to be legal advice, nor does it form the basis for any attorney-client relationship whatsoever, which can only be formed upon signing an Engagement Agreement and depositing a Retainer Fee into client trust. Further, I am only licensed in Oregon and laws vary from state to state. If you have an Oregon-related issue, feel free to contact me for a consultation. If you are outside of Oregon, please consult an attorney in your area for legal advice.
Police reports are public records and anyone can request a copy from the police department. Contact that police department and ask them what you need to do to request a copy. You might need to pay a fee. As for discovery - that is between the parties of the case and usually not part of the court record. The court record including the recording of any trial or hearing is public record and can be obtained. You can go down to the courthouse and request a copy of any file, although sometimes personal information is restricted. This should lead you to the names of the attorneys involved and you can try calling either of the attorneys and asking if they will share information. You can also purchase a copy of the recording of any proceeding and listen to it on your computer. If a witness testified you would be able to hear their statement.
You don't tell us why you need this info. We could be more helpful if we knew why you are looking for this. Your other option is to hire a private investigator to get information for you. In additional to checking the public records they may have contacts that you don't that will help them get additional info. http://www.portlandlegalservices.com
The comments by this author to questions posted on Avvo are designed to foster a general understanding of what might be the law governing the area of the legal problem stated and suggest what might be the approach to finding a legal solution. Under no circumstances is this author acting as the attorney for the party who posted the question or as the attorney for subsequent readers to the question or response and no attorney client relationship is being formed. This attorney's comments are not intended to be a substitute for getting legal advice from a licensed attorney. A reader of this author's comments should never act on the information provided in these comments as though these comments were legal advice and should always seek legal advice in a personal consultation with an attorney in their jurisdiction before taking action. The information provided here is not intended to cover every situation with similar facts. Please remember that the law varies between states and other countries and is always changing through actions of the courts and the Legislature.