Text messages, app chats, and social media direct messages are often central evidence in Article 120 sexual assault prosecutions under the Uniform Code of Military Justice. They can show the relationship between the parties, statements about consent, or efforts to discuss what happened afterward. But before a panel of members ever reads a single message, the government must show that the digital record is genuine and reliable. That showing rests on two related but distinct ideas: authentication of the messages and the chain of custody for the device or extraction that produced them.
Authentication comes first
Under Military Rule of Evidence 901, the proponent of any item of evidence must produce enough proof to support a finding that the item is what it is claimed to be. For a set of text messages offered in an Article 120 case, that means the prosecution must show the messages are the actual messages exchanged by the people the government says exchanged them. The standard is not proof beyond a reasonable doubt. The proponent needs only a prima facie showing, and the military judge makes a preliminary ruling that there is sufficient evidence for the members to decide authenticity for themselves.
MRE 901 lists ways to do this. A witness with personal knowledge, such as one of the people in the conversation, can testify that the screenshots or extraction accurately reflect what was sent and received. Authentication can also rest on distinctive characteristics, including the phone number, account handle, the substance of the messages, references to events only the participants would know, and the surrounding context. In digital cases, a forensic examiner who extracted the data can describe the process used and confirm that the output reliably reflects the contents of the device.
Where chain of custody fits
Chain of custody is the documented history of who handled the evidence, when, and what was done to it. With a physical item the concern is tampering or substitution. With digital messages the concern is the same in principle but sharper in practice, because electronically stored information can be altered, deleted, or selectively captured. The chain of custody answers a basic question: from the moment the phone or account data was seized or collected, can the government account for its handling so that the panel can trust the version presented in court matches the original?
In a typical Article 120 case, that chain might begin when an investigator seizes a complainant’s or accused’s phone, continues through a forensic extraction using validated tools that produce a complete report of the messages, and ends with the exhibit offered at trial. Each transfer and each step should be documented so that gaps can be identified and explained.
The reasonable probability standard
A common misunderstanding is that any break in the chain makes digital evidence inadmissible. That is not the law. The government is not required to exclude every conceivable possibility of alteration. It must show, by direct or circumstantial evidence, a reasonable probability that the evidence is what it purports to be and that it has not been changed in any material way. When the government meets that threshold, gaps or weaknesses in the chain of custody go to the weight the members give the evidence, not to whether they may see it at all.
This distinction is decisive in practice. If an investigator cannot account for a short period during which a phone sat in an evidence locker, that lapse usually does not bar the messages. Instead, the defense argues to the members that the gap creates doubt about reliability, and the members decide how much trust the evidence deserves.
How the defense tests the chain in an Article 120 case
Because the messages can be so persuasive on issues like consent, the defense scrutinizes both authentication and custody closely. Lines of attack include whether screenshots are complete or selectively cropped, whether the conversation is presented out of order or stripped of context, whether the account truly belongs to the person the government names, and whether anyone with access to the device could have sent, deleted, or edited messages before collection. Metadata, such as timestamps and message identifiers, often becomes the battleground, since a forensic extraction preserves far more detail than a phone screenshot does.
The defense may also probe the extraction itself: which tool was used, whether it was validated, whether the examiner followed accepted procedures, and whether the produced report is a faithful and complete copy. Where the government relies only on a screenshot rather than a forensic extraction, the authentication and custody showing is often thinner, and that weakness can be argued to the members.
Self-authenticating electronic records
In some cases the government can streamline the process using self-authentication provisions. MRE 902 allows certain records to be authenticated by a written certification rather than live testimony, including records of a regularly conducted activity and, importantly for digital evidence, data copied from an electronic device, storage medium, or file that is certified by a qualified person as the product of a reliable process. Using a certification can establish that the extraction was technically sound, though it does not by itself prove who authored a particular message. The content still must be tied to the sender through the methods described above.
Why this matters in Article 120 cases specifically
Sexual assault prosecutions frequently turn on credibility and on what the parties said before and after the encounter. A single message can support either the prosecution’s theory of nonconsent or the defense’s theory that the interaction was consensual. Because the stakes are so high, both sides have strong incentives to fight over whether the digital record is complete, accurate, and untampered. The verification framework, authentication under MRE 901 and 902 combined with a documented chain of custody judged by the reasonable probability standard, is what allows the members to weigh these messages with confidence rather than guesswork.
For any service member facing an Article 120 charge that hinges on digital messages, the integrity of that evidence is a serious issue worth examining closely with qualified defense counsel, who can review the extraction, the custody documentation, and the completeness of the record.
Disclaimer
This article is provided strictly for general educational and informational purposes. It is intended to explain how the Uniform Code of Military Justice (UCMJ), the Rules for Courts-Martial, the Military Rules of Evidence, and related military administrative processes work as a matter of public legal education. It does not constitute legal advice, a legal opinion, or a recommendation about any particular case, and it is not a substitute for advice from a qualified military defense attorney who can evaluate the specific facts and command, service, and jurisdictional circumstances involved.
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Military law also changes over time. The Military Justice Act of 2016 (effective January 1, 2019) and subsequent National Defense Authorization Acts renumbered and rewrote many punitive articles, revised the Article 32 preliminary hearing, and altered sentencing, clemency, and appellate procedures. Statutes, regulations, executive orders, the Manual for Courts-Martial, and decisions of the service Courts of Criminal Appeals and the Court of Appeals for the Armed Forces may have been amended, superseded, or reinterpreted after this article was written, and article numbers or procedures cited here may have changed.
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