Hair Analysis in Forensic Science by Ayja Rampersad https://padlet.com/rampa4213/bms7weh7gxlb Ayja Rampersad en-us 2019-05-07 14:33:19 UTC 2024-10-16 00:24:52 UTC hello@padlet.com A TIMELINE rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357647852 1950's
- hair analysis is accepted as a forensic science
1960's
- begins to claim a stronger standard
1970's
- used as evidence to convict people of crimes
1974
- researchers suspect that microscopic hair comparison is completely subjective
1980's
1984
- the FBI confirms that it can not be used to positively match a single individual ]]> 2019-05-07 14:41:00 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357647852 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653237 2019-05-07 14:50:58 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653237 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653380 2019-05-07 14:51:14 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653380 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653620 2019-05-07 14:51:41 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653620 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653822 2019-05-07 14:51:59 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357653822 THE PROCESS rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357659206 - two hair strands are compared
- more than 12 factors are monitored
(eg. pigmentation distribution and scale patterns)]]> 2019-05-07 15:00:39 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357659206 COMPARISON MICROSCOPE rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357664735 2019-05-07 15:08:48 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357664735 CURRENTLY rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/357665036 - microscopic hair analysis is usually considered unreliable
- results occasionally contradict those of a DNA test
- much more suiting being used as a tool to narrow a field of investigation, as opposed to using it as evidence to convict a person of a crime]]> 2019-05-07 15:09:17 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/357665036 POTENTIAL INFORMATION rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358030447 - the medulla of the hair shaft can be used to identify the race of a person
- the root of the hair shows if the sample was cut, pulled or shed from the head
- the follicle can contain useful DNA for screening]]> 2019-05-08 13:25:45 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358030447 TOXIC SUBSTANCE CARRIERS rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358036730 - hair can be used for preliminary screening of effects of toxic substances in:
  • air
  • dust
  • sediment
  • food
  • water 
- there is also some experimentation with hair analysis in alternative medicine 
]]> 2019-05-08 13:37:56 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358036730 DETECTION rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358037154 - hair analysis in environmental toxicology can be used as a biological indicator to detect:
  • long-term heavy metal burden
  • Mn, Pb, Cr, Cu, Hg, Co, Li, Sr
  • supplementation in pregnant women
  • organic pollutants
  • pesticides
]]> 2019-05-08 13:38:51 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358037154 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358038812 2019-05-08 13:41:35 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358038812 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358041629 2019-05-08 13:46:40 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358041629 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358042425 2019-05-08 13:48:02 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358042425 DRUG DETECTION rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358044956 - hair can be used to detect the usage of:
  • cocaine
  • heroin 
  • benzodiazepines (valium, xanax)
  • amphetamines (methylphenidate)
]]> 2019-05-08 13:52:22 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358044956 PROS rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358046763 - less invasive than obtaining a blood or urine sample
- analysis may be achieved under supervision of law enforcement to ensure genuineness of results
- window of drug detection is weeks, months,sometimes years]]> 2019-05-08 13:54:56 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358046763 rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358048456 2019-05-08 13:57:46 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358048456 CONS rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358049365 - cosmic treatments (colouring, perming) can interfere
- hair analysis is usually considered controversial, evolving and not standardized  ]]> 2019-05-08 13:59:21 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358049365 APPLICATIONS rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358050693 - hair analysis has many applications, including:
  • screening of drug addicts
  • child abuse
  • drug‐facilitated crimes
  • sexual assaults under the influence of drug
  • doping control in sport 
  • workplace drug testing
]]> 2019-05-08 14:01:32 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358050693 HAIR ANALYSIS HAS AT LEAST FIVE STEPS rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358053946 2019-05-08 14:06:52 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358053946 1. DECONTAMINATION OF THE HAIR rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358054530 - best samples include at least 50 hair shafts]]> 2019-05-08 14:07:52 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358054530 2. PREPARATION OF THE HAIR rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358054735 - pulverization, segmentation into short segments]]> 2019-05-08 14:08:12 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358054735 3. INCUBATION rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358056251 - in methanol, acid, sodium hydroxide, buffer, or water solutions]]> 2019-05-08 14:10:37 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358056251 4. EXTRACTION rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358056529 - liquid/liquid, solid phase, solid phase microextraction]]> 2019-05-08 14:11:07 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358056529 5. ANALYSIS rampa4213 https://padlet.com/rampa4213/bms7weh7gxlb/wish/358056783 -  immunoassay screening or chromatography]]> 2019-05-08 14:11:32 UTC https://padlet.com/rampa4213/bms7weh7gxlb/wish/358056783