Article 31 absolutely applies to investigations that could result in non-judicial punishment proceedings under Article 15. The rights attach whenever military personnel suspect a service member of any offense punishable under the UCMJ, regardless of whether commanders intend criminal prosecution or administrative action. Since Article 15 proceedings address UCMJ violations, all questioning about suspected offenses requires Article 31 warnings. Commanders and first sergeants cannot circumvent these requirements by characterizing investigations as “administrative” when examining criminal misconduct.
The scope of protection during Article 15 investigations mirrors that in criminal cases. Service members must receive warnings before questioning about suspected offenses, whether conducted by commanders, first sergeants, or appointed investigating officers. The informal nature of many Article 15 investigations creates frequent violations when leaders view warnings as unnecessary for “minor” offenses. However, Article 31 makes no distinction based on offense severity or intended disposition – the obligation to warn remains constant.
Common violations occur during commander inquiries that begin as performance counseling but shift to suspected misconduct. Once questioning turns to specific UCMJ violations, Article 31 warnings become mandatory. Many commanders mistakenly believe their positions create exceptions or that “fact-finding” escapes Article 31 requirements. Military courts consistently reject such arguments, suppressing statements obtained during unwarned commander investigations regardless of rapport or intent to help subordinates.
Consequences of Article 31 violations during Article 15 investigations extend beyond immediate proceedings. While unlawfully obtained statements cannot support non-judicial punishment, they also become inadmissible if cases later proceed to court-martial. Commanders cannot use tainted statements for any adverse action including administrative separations, evaluation downgrades, or security clearance determinations. Service members who provided unwarned statements during Article 15 investigations should immediately consult defense counsel about suppression options and potential broader impacts. The protection ensures that informal disciplinary processes don’t become vehicles for circumventing fundamental rights.