Here are some links and principles that will assist you constructing your hypothetical arguments:
Commonwealth v. Koch - Pennsylvania Supreme Court held that both authentication and admissibility must be addressed in determining whether text messages are admissible in a criminal trial. The text messages in this case were not admissible as hearsay was because the Commonwealth was not able to show who the author of the messages was. It is not enough to show that the account belongs to a person because other people can have access to accounts as noted by the Court.
Rodriguez v. Nevada Nevada Supreme Court held that text messages should not have been admitted into evidence absent evidence that corroborated that the defendant was the sender of the messages. Authentication is the precursor to admissibility so, whether proponent or opponent, the first step is whether a proper foundation has been laid that authenticates the message.
COMPULSION OF TEXT MESSAGES http://www.bu.edu/law/central/jd/organizations/journals/bulr/documents/KEMPER.pdf
Anti-Wiretapping Law -To protect the privacy of communication, Congress enacted the Anti-Wiretapping Law. Under this law, it is “unlawful for any person, not being authorized by all the parties to any private communication or spoken word, to tap any wire or cable, or by using any other device or arrangement, to secretly overhear, intercept, or record such communication or spoken word by using a device commonly known as a dictaphone or dictagraph or walkie-talkie or tape recorder, or however otherwise described.” (Section 1).
Section 4 of the law provides that any communication or spoken word, or the existence, contents, substance, purport, effect or meaning of the same or any part thereof, or any information contained therein obtained or secured by any person in violation of the foregoing provision shall not be admissible in evidence in any judicial, quasi-judicial, legislative or administrative hearing or investigation.
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