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1.1 This guide describes methods to be used for labeling physical evidence collected during field investigations; received in a forensic laboratory; or isolated, generated, or prepared from items submitted for laboratory examination.

1.2 Many types of physical evidence may be hazardous. It is assumed that personnel assigned to the collection, packaging, storing, or analysis of physical evidence will take precautions as appropriate to the evidence.

1.3 This guide offers a set of instructions for performing one or more specific operations. This standard cannot replace knowledge, skill, or ability acquired through appropriate education, training, and experience and should be used in conjunction with sound professional judgment.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

4.1 By following the procedures specified in this guide, any item of physical evidence will have a traceable audit trail by which the origin, past history, treatment, and analysis of the item can be determined.

4.2 By following these procedures, the chain of custody of any item of physical evidence will be maintained and documented.