The only way that you will be able to determine whether a certain informant was used in the arrest of your brother is if the testimony of the informant is necessary for the prosecution to convict your brother. Otherwise, police are allowed to rely on anonymous information in an arrest, as long as the information is reasonably reliable.
It will be in the police report and the declaration of probable cause, if they are using any information form the informant. You won't be able to find out who the CI is without an order from the Judge, however. The trick is to show what the CI said is necessary to justify the arrest or necessary to convict. Then, if the State won't reveal who it is, the you can bring a motion to dismiss. This is why you need a good lawyer.
Eventually, yes, you can find out if an informant was used by the cops when the police reports and other information gets turned over to your attorney. The identity of the informant is another matter that usually has to be litigated.
I would recommend contacting a criminal defense attorney in your area to discuss this question in more detail. Although it may be possible to find out this information in advance of charges getting filed if you can get your hands on a police report, that information can be determined by your attorney who is defending you in the case. Your attorney can also determine if there are any good suppression motions, confrontation clause issues, etc that can help defend your case. If you are in Los Angeles County, feel free to contact me at 818-336-1384 to discuss your case in more detail. Legal disclaimer: This message does not constitute legal advice and is for informational purposes only. This message does not establish an attorney-client relationship, which can only be established once a retainer agreement has been fully executed between you and this firm.
Maybe. If a warrant was issued, they may have used the report of a confidential informant as probable cause for the search warrant. If so, that might be addressed in the warrant, although it won't give the informant's name. You need to hire an attorney. He can help you find out what happened.
The police report should state whether or not an informant was involved although it probably won't reveal the name. You may request a FOIA on the officer's notes and reports regarding the case. An attorney may file a motion asking the Court to order the prosecution to disclose the identify of the informant.
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