Private messages on platforms like Facebook Messenger, Instagram, Snapchat, and similar services are now routine evidence in military prosecutions. When the government accuses a service member of solicitation, the alleged proof often consists of direct messages said to have been sent by the accused. The question of whether those private messages can be admitted at a court-martial does not have a simple yes-or-no answer. The messages can be admissible, but only if the government clears several distinct evidentiary hurdles under the Military Rules of Evidence. The most important and most contested of these is authentication.
What solicitation requires
Solicitation in the military is, in general terms, the act of advising, counseling, commanding, or otherwise seeking to induce another person to commit an offense. The content of a communication is frequently the core of the proof. If the government alleges that the accused used private messages to urge someone to commit a crime, the words of those messages are what tend to establish the solicitation. That is exactly why the admissibility of the messages is so central to these cases: the messages are not background, they are the alleged act itself.
Authentication is the threshold problem
Before any document or electronic communication can be admitted, it must be authenticated. Under the Military Rules of Evidence, the authentication requirement, which parallels the federal rule, demands evidence sufficient to support a finding that the item is what its proponent claims it to be. The standard does not change because the evidence is digital rather than on paper; the same authentication principle applies to a screenshot of a chat as to a signed letter.
For private social media messages, authentication has two layers that are easy to confuse but legally distinct. The first is authenticating that the message exists and was received in the form presented, which can often be established by testimony from the person who received it or who captured it. The second, and far harder, layer is proving who actually authored the message. Demonstrating that a message came from a particular account is not the same as demonstrating that the accused, rather than someone else, wrote and sent it.
Proving authorship, not just account ownership
The decisive issue in most contested social media cases is authorship. Courts have repeatedly recognized that one who receives an electronic message can authenticate having received it simply by testifying to that fact, but proving the …