Yes. Such things as illegally recorded conversations, illegally intercepted e-mails, etc.are not admissible in evidence, and there may be adverse consequences to the party or attorney who obtained those matters illegally.
Please note that this answer does not constitute legal advice, and should not be relied on, as each situation is fact specific, and it is not possible to evaluate a legal problem without a comprehensive consultation and review of all the facts and court pleadings filed in the case. This answer does not create an attorney-client relationship.
I agree with Mr. Conviser. Just remember that what may be "illegal" methods of obtaining evidence for the police are governed by different standards than for the public at large. The police are government agents and are bound by certain constitutional standards that regular people are not subject to.
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Of course, your state's attorneys are the best source of information. It is important to also remember that despite what should be uniform "rules" of evidence, as a practical matter what "evidence" will be allowed may vary considerably from court to court and even judge to judge within the same court, particularly in Family Court (where hearsay and other questionable evidence is often freely admitted). Moreover, the remedy for improperly admitted evidence is to appeal the Court's decision, which often means living with it for a long time pending an appeal. As such, it would be a mistake to assume improperly obtained evidence will not be admitted, and if such evidence is prejudicial to you then you must be prepared to defend against it just as you would any other evidence. If much is at stake, you certainly should have a confidential consultation with a local attorney who knows your court and can advise you on your issue accordingly. You can find attorneys in your area by searching among the profiles here on AVVO. Good luck!
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