This document is a voluntary performance standard for chemical, biological, radiological and nuclear (CBRN) protective ensembles for use by law enforcement. It defines both performance requirements and the methods used to test performance. In order for an ensemble manufacturer or other entity to claim that a particular CBRN protective ensemble model satisfies this National Institute of Justice (NIJ) standard, the model must be in compliance with this standard as determined in accordance with this document and the associated document, Law Enforcement CBRN Protective Ensemble Certification Program Requirements, NIJ CR-0116.00. Both this standard and the associated certification program requirements document are produced as a part of the Standards and Testing Program of the U.S. Department of Justice, Office of Justice Programs, NIJ, as is a third associated document, the Law Enforcement CBRN Protective Ensemble Selection and Application Guide, NIJ Guide-0116.00.