CJ235-01 Unit 2 Canines in Criminal Justice Factors that Affect Scent.

CJ235-01 CJ235-01 Unit 2Unit 2

Canines in Criminal JusticeCanines in Criminal Justice

Factors that Affect ScentFactors that Affect Scent


• We will be speaking in terms of We will be speaking in terms of environmental factors that affect scent environmental factors that affect scent mostly outdoors.mostly outdoors.


• We will be speaking in terms of We will be speaking in terms of environmental factors that affect scent environmental factors that affect scent mostly outdoors.mostly outdoors.

• These factors actually must be These factors actually must be considered whether searching for a considered whether searching for a person or a substance such as an person or a substance such as an explosive or narcotics.explosive or narcotics.


• Since we will be discussing searching or Since we will be discussing searching or tracking outdoors for people in the next tracking outdoors for people in the next unit, we will focus on those unit, we will focus on those environmental factors that occur environmental factors that occur outdoors.outdoors.


• Since we will be discussing searching or Since we will be discussing searching or tracking outdoors for people in the next tracking outdoors for people in the next unit, we will focus on those unit, we will focus on those environmental factors that occur environmental factors that occur outdoors.outdoors.

• These same facts apply whether These same facts apply whether searching for a fleeing criminal or a lost searching for a fleeing criminal or a lost child.child.

Air CurrentsAir Currents

• Do you always know when the wind Do you always know when the wind blowing?blowing?


• Do you always know when the wind Do you always know when the wind blowing?blowing?

• Syrotuck (2000) tells us of Syrotuck (2000) tells us of micrometeorology and how temperatures micrometeorology and how temperatures can vary from just a few inches off the can vary from just a few inches off the ground to a few feet and so can the ground to a few feet and so can the slightest air current.slightest air current.


• We see that any obstruction can affect We see that any obstruction can affect wind flow and therefore affect scent.wind flow and therefore affect scent.

Reproduced with Permission from Barkleigh.com © 2000Syrotuck, W. G. (2000). Scent and the scenting dog. Mechanicsburg, PA: Barkleigh .

Turbulence

WIND


• Natural Terrain can have an even more Natural Terrain can have an even more profound affect on a person’s scent.profound affect on a person’s scent.

Reproduced with Permission from Barkleigh.com © 2000Syrotuck, W. G. (2000). Scent and the scenting dog. Mechanicsburg, PA: Barkleigh.

Obstruction Dead Area

Turbulence


• This diagram illustrates how obstruction This diagram illustrates how obstruction can deflect scent in different directions.can deflect scent in different directions.

Victim

Scent Deflected



• With no terrain, the velocity of the air With no terrain, the velocity of the air current determines the dispersion.current determines the dispersion.

Scent Cones WIND DIRECTION

Slow Winds

High WindsDiagram by Jonathan Dorriety

Victim

Victim

Air Currents/TerrainAir Currents/Terrain

• Scent can often be carried with the path Scent can often be carried with the path of least resistance if obstructions create of least resistance if obstructions create one.one.

Victim

Dense Obstruction


TerrainTerrain

• The lay of the land can also affect where The lay of the land can also affect where scent flows and pools if wind is not a scent flows and pools if wind is not a factor.factor.

Downward Slope

Pooling Scent


TemperatureTemperature

• How does temperature affect scent?How does temperature affect scent?


• How does temperature affect scent?How does temperature affect scent?• Cool air on hilltops warms in the Cool air on hilltops warms in the

morning and is replaced by cool air morning and is replaced by cool air flowing uphill.flowing uphill.



• How does temperature affect scent?How does temperature affect scent?• As the day grows warm cool air will As the day grows warm cool air will

descend downhill.descend downhill.


Crevice


• A person hiding outside in cool weather A person hiding outside in cool weather is more easily found than a person hiding is more easily found than a person hiding in warm weather. Why?in warm weather. Why?


• A person hiding outside in cool weather A person hiding outside in cool weather is more easily found than a person hiding is more easily found than a person hiding in warm weather. Why?in warm weather. Why?

• Our warm bodies will simply produce Our warm bodies will simply produce more scent when our surroundings are more scent when our surroundings are cooler, just as a deceased person whose cooler, just as a deceased person whose body has lost all heat will be more body has lost all heat will be more difficult to locate in cool weather.difficult to locate in cool weather.

HumidityHumidity

• How do you think humidity plays into the How do you think humidity plays into the scent picture?scent picture?

HumidityHumidity


• Moist air (especially cool air) makes it Moist air (especially cool air) makes it easier on a dog. Bacteria and skin rafts easier on a dog. Bacteria and skin rafts flourish better with moisture in the air.flourish better with moisture in the air.

HumidityHumidity


• Moist air (especially cool air) makes it Moist air (especially cool air) makes it easier on a dog. Bacteria and skin rafts easier on a dog. Bacteria and skin rafts flourish better with moisture in the air.flourish better with moisture in the air.

• Dogs also can work for longer periods Dogs also can work for longer periods without rest in cool, moist environments.without rest in cool, moist environments.

Summary Summary

• Wind is a major factor on scent in an Wind is a major factor on scent in an outdoor environment. They can be outdoor environment. They can be indoors as well, but generally not to the indoors as well, but generally not to the same extreme.same extreme.

Summary Summary

• Wind is a major factor on scent in an Wind is a major factor on scent in an outdoor environment. They can be outdoor environment. They can be indoors as well, but generally not to the indoors as well, but generally not to the same extreme.same extreme.

• Obstacles and the lay of the land will also Obstacles and the lay of the land will also have a strong influence on scent.have a strong influence on scent.

Summary Summary

• Wind is a major factor on scent in an Wind is a major factor on scent in an outdoor environment. They can be indoors outdoor environment. They can be indoors as well, but generally not to the same as well, but generally not to the same extreme.extreme.

• Obstacles and the lay of the land will also Obstacles and the lay of the land will also have a strong influence on scent.have a strong influence on scent.

• Temperature and humidity in various Temperature and humidity in various combinations can be good or bad.combinations can be good or bad.

Questions or Discussion?Questions or Discussion?

CJ235-01 Unit 2 Canines in Criminal Justice Factors that Affect Scent.

Documents

Transcript of CJ235-01 Unit 2 Canines in Criminal Justice Factors that Affect Scent.