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CRIMESCENESCENT
EVIDENCEPROCESSING -JeffSchetler(GeorgiaK9NTC)
P RESENTATION
Mr.Tolhurstwrote,Imustgivehim creditforbringingatentiontosomethingveryimportant:HumanScent Evidence.Theproblem withmostcrimescenesasfarashumanscentevidencegoesisthatitisusualy compromisedinsomewaylongbeforetheK9canuseit.Thereareseveralwaysthishappensbutbeforewe talkaboutthem,let’stalkaboutwhatscentisandhowmuchweactualyproduce.
Humanscentisbestvisualizedintheform ofskincelsthataremicroscopicandfalofaswemoveabout inourdailylives.Themoreweexertourselvesandthemoreemotionalyagitatedwebecome,themorescent celsloughingwemakehappen.Skincelsfalofthebodyatanunknownrate,butIbelieveitisconsistent w ith a s n o w s to rm . T h e s k in c e l ls , o r th e ir o f f-g a s s in g fro m b io lo g ic a l a c tiv ity d u e to b a c te ria g ro w th , is w h a t dogsusedtotrackortrail.Theotherform ofhumanodoristheactualof-gassingofthehumanbodyand thereissomesciencebehindthis.From avisualperspective,wehumansappeartobewalking,talking
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solveacrimethatperhapscouldnotbesolvedanyotherway.Scentevidenceis trulytheforgotenevidenceasfirstdescribedbyBilTolhurstin1977.ThoughBil pioneeredmanythingswithhumanscentevidenceanditsuse,Ibelievehewas fartooliberalinhisbeliefofhow dogsutilizeit,especialywhenitcametohis colectionmethodsthatIferventlydisagreewith.Bilwasdefinitelyontosomething h o w e v e r, I d o n o t th in k h e fu l ly u n d e rs ta n d h o w e a s ily h u m a n s c e n t c o u ld b e destroyedand/orcontaminated.Hiscolectionprocess,inmyopinion,wasnot
R O D U C T IO N R O T E C T IO N
e f fe c tiv e . H o w e v e r, th is a rtic le is n o t m e a n t to b e a debateortodiscreditMr.Tolhurst.Hewasamaverick forhistimeandwasdirectlyresponsibleforproducing some amazing K9’s and new methods of K9 deployment.ThoughIdonotagreewithsomeofwhat
nsmokegrenadesthatmaylooklikesmokefrom thechimneyofaheartyfireplace.Humanscentis verysimilartosmokeinmanywaysinthatthesubstancebeingburntinafireoftendeterminesthecoloror shadeofgreyofsmoke.Sotoodoeseachhumancreatetheirownscentpicture.K9’sscentdiscriminates preyspeciesamazinglywel.Sotoocantheydiscriminatehumansgiventherightconditions.Inaway,they visualizeanindividualhumanscenttrailikeanindividualthreadwithitsownuniquecolororplumeofcolored smoke.Ibelievedogs,thoughlackingtheabilitytodiscerncolors,visualyhaveaveryvividandpictographic
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abilityonparwithourvision.Dogsdidnotdevelopvisionsimilartooursbecausetheirolfactory system filedthatgap.K9visualacuityisbasedonmovementnotvisualdefinitionofobjectslikeours.I believetheK9nosedescribesthingsbeterthanoureyesevercould.Thehumansmokebombvisualization appliestoanairscentconditionwhenthedogdetectshumanodoronthewindorair.Thethirdtypeofhuman scentiscontactodor.Thisismadeupofphysicalsubstancesintheform ofskincelsandoilsdirectlyfrom thehumanbody.
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