Protection
The best form of preservation is first to photograph it in situ or where the object is first located, and then take the object which shows key traces, protect it and analyse later under controlled laboratory conditions.
Many different techniques are used in the protection of trace evidence from criminal investigations, although all must be photographed when fresh and still in place. Samples may be collected by shaking, brushing, taping, vacuuming, swabbing and hand picking, although great care may be needed to prevent contamination with other substances (such as natural oil and sweat on the hand of the collector). In some cases, such as with oil or grease, a solvent extraction can be used to collect the evidence for analysis. The method used for collection is generally dependent on both the type of evidence and from where or what sort of object it is being collected.
Trace Evidence is also found in much smaller amounts at crime scenes.
Read more about this topic: Trace Evidence
Famous quotes containing the word protection:
“We’re for statehood. We want statehood because statehood means the protection of our farms and our fences; and it means schools for our children; and it means progress for the future.”
—Willis Goldbeck (1900–1979)
“Men speak of natural rights, but I challenge any one to show where in nature any rights existed or were recognized until there was established for their declaration and protection a duly promulgated body of corresponding laws.”
—Calvin Coolidge (1872–1933)
“We cannot spare our children the influence of harmful values by turning off the television any more than we can keep them home forever or revamp the world before they get there. Merely keeping them in the dark is no protection and, in fact, can make them vulnerable and immature.”
—Polly Berrien Berends (20th century)