Handbook of Forensic Services (pdf) - FBI
Handbook of Forensic Services (pdf) - FBI
Handbook of Forensic Services (pdf) - FBI
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<strong>Handbook</strong> <strong>of</strong> Forens c Serv ces 2007<br />
When compar son samples are ava lable, t may<br />
be poss ble to comment regard ng the cons stency<br />
<strong>of</strong> the unknown substance compared w th a<br />
known sample.<br />
Call the Laboratory at 703-632-8441 prior to<br />
submitting general unknowns to ensure that<br />
the evidence will be accepted for examination.<br />
The commun cat on accompany ng the ev dence<br />
must reference the telephone conversat on<br />
accept ng the ev dence.<br />
Questions concerning examinations <strong>of</strong> general<br />
unknowns should be directed to 703-632-8441.<br />
Follow the ev dence subm ss on d rect ons,<br />
nclud ng Requesting Evidence Examinations<br />
and Packaging and Shipping Evidence.<br />
ß<br />
Subm t powder and l qu d samples n<br />
leakpro<strong>of</strong> conta ners.<br />
Do not subm t large sta ned ev dence. When<br />
poss ble, cut a small sample <strong>of</strong> the sta ned area<br />
and subm t n a heat-sealed or resealable plast c<br />
bag. Collect an unsta ned control sample,<br />
package separately, and subm t t w th the sta ned<br />
ev dence. When cutt ng s not poss ble, transfer<br />
quest oned sta ns by rubb ng w th a clean (dry or<br />
wet w th alcohol) cotton swab. Use an unsta ned<br />
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