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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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