Manual de servicios forenses



Handbook of Forensic Services
(revsed 2007) Editor Km Waggoner Editorial Assistant Kathryn H. Suchma Graphic Design Sandra D. Hollday An FBI Laboratory Publcaton Federal Bureau of Investgaton Quantco, Vrgna ISBN 978-0-16-079376-9



Table of Contents
Introducton. . . . . . . . . . . . . . . . . . . . . 1 Submttng Evdence. . . . . . . . . . . . . . 7 EvdenceExamnatons. . . . . . . . . . . 13 Crme Scene Safety. . . . . . . . . . . . . 147 Crme Scene Search . . . . . . . . . . . . 171 Index. . . . . . . . . . . . . . . . . . . . . . . . 185



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INTRODUCTION

Handbook of Forensc Servces 2007

Introduction
The Handbook of Forensic Services provdes guidance and procedures for safe and efficient methodsof collectng, preservng, packagng, and shppng evdence and descrbes the forensc examnatons performed by the FBI’s Laboratory Dvson and Operatonal Technology Dvson.

FBI Forensic Services
The successful nvestgaton and prosecuton of crmes requre, n most cases, the collecton, preservaton, and forensc analyss of evdence. Forensc analyss of evdence s often crucal todetermnatons of gult or nnocence. The FBI has one of the largest and most comprehensve forensc laboratores n the world, and the FBI Laboratory s accredted by the Amercan Socety of Crme Laboratory Drectors/ Laboratory Accredtaton Board. The forensc servces of the FBI Laboratory Dvson and the Operatonal Technology Dvson are avalable to the followng: ß FBI field officesand legal attachés.

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Handbook of Forensc Servces 2007

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U.S. attorneys, mltary trbunals, and other federal agences for cvl and crmnal matters. State, county, and muncpal law enforcement agences n the Unted States and terrtoral possessons for crmnal matters.

All forensc servces, ncludng expert wtness testmones, are rendered free of cost; however, thefollowng lmtatons apply: ß No examnaton wll be conducted on evdence that has been prevously subjected to the same type of examnaton. Exceptons may be granted when there are reasons for a reexamnaton. These reasons should be explaned n separate letters from the drector of the laboratory that conducted the orgnal examnaton, the prosecutng attorney, and the nvestgatng agency.No request for an examnaton wll be accepted from laboratores havng the capablty of conductng the examnaton. Exceptons may be granted upon approval of the FBI Laboratory Drector or a desgnee. No testmony wll be furnshed f testmony on the same subject and n the same case s
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Handbook of Forensc Servces 2007

provded for the prosecuton by another expert. ß Norequest for an examnaton wll be accepted from a nonfederal law enforcement agency n cvl matters.

In addton, when submttng evdence to the FBI Laboratory, contrbutors acknowledge the followng: ß FBI examners wll choose approprate techncal processes to address the contrbutor’s request for examnaton. Dependng on the caseload of the Laboratory and the needs of the contrbutor,evdence examnatons may be subcontracted. An FBI Laboratory Report of Examnaton may contan the opnons and/or nterpretatons of the examner(s) who ssued the report.

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Violent Crime Versus Property Crime
The FBI accepts evdence related to all crmes under investigation by FBI field offices; however, it accepts from state and local law enforcement agences only evdencerelated to volent crme

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Handbook of Forensc Servces 2007

nvestgatons. The FBI does not routnely accept evdence from state and local law enforcement agences n cases nvolvng property crmes unless there was personal njury or ntent to cause personal njury. These gudelnes help to ensure that the FBI contnues to provde tmely forensc assstance to law enforcement agences...