Darryl Hunt — Transcript

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1. 0:00hi today I'll be talking about DNA
2. 0:02fingerprints which is used for
3. 0:04convicting criminals the two main
4. 0:06analysis that Moc biologists using DNA
5. 0:08fingerprints or restriction fragment
6. 0:10lens polymorphism and short tandem
7. 0:12repeats method used by maler biologists
8. 0:14in which crime scen investigators can
9. 0:16obtain blood semen urine hair saliva and
10. 0:19other evidence known as evidence sample
11. 0:21that can provide a DNA profile a
12. 0:24reference samples such as blood from a
13. 0:26suspect and by the way one nanogram of
14. 0:28DNA is usually a efficient quantity to
15. 0:31provide good
16. 0:32data then the use of restriction induc
17. 0:35cleus enzyme to cut up DNA into
18. 0:37different length separating the DNA
19. 0:40fragments by a gross gel electris
20. 0:42determining the number of fragments in
21. 0:44relative size which is ultim used
22. 0:46predominantly by DNA Laboratories until
23. 0:48newer technology was developed in the
24. 0:51past it could take as long as a couple
25. 0:53of weeks to obtain results using rflp it
26. 0:56also requires the use of a sizable
27. 0:58amount of DNA the second method is short
28. 1:00tandem repeats which forensic DNA
29. 1:03started to use in 1991 in short tandem
30. 1:05repeats we need biology to extract and
31. 1:07deern DNA quantity and to use PCR for
32. 1:10amplification of multiple SDR
33. 1:17markers but the use of Str strr is
34. 1:19becoming the preferred method of
35. 1:20analysis because of its accuracy and
36. 1:22most importantly because s strr uses
37. 1:24shorter strands of DNA while rlp require
38. 1:28a large amount of undamaged DNA DNA
39. 1:30therefore the FBI has chosen 13 specific
40. 1:34s Str loai to serve as the standard for
41. 1:37coding when a DNA polymeros encounters a
42. 1:40repeated sequence it has a tendency to
43. 1:42slip a little leading to increase and
44. 1:44decrease in the number of repeats which
45. 1:46is a source of polymorphis by
46. 1:49determining the sequence that margin the
47. 1:51St strr and amplifying them through PCR
48. 1:54which stands for polymerase Chain
49. 1:56Reaction the difference in length can be
50. 1:58detected by gel electroforesis
51. 2:00we also need technology to separate and
52. 2:02distinguish the repeated sequence that
53. 2:03was C by PCR and finally we use genetics
54. 2:07to compare samples of genotypes to other
55. 2:09sample results in other words Str strs
56. 2:13are short segments of DNA that are
57. 2:14repeated a number of times in a sequence
58. 2:17the second method is short tandem
59. 2:19repeats which forensic DNA started to
60. 2:21use in 1991 in short tandm repeats we
61. 2:24need biology to extract and deern DNA
62. 2:27quantity and to use PCR for
63. 2:29amplification of multiple SDR
64. 2:32markers but what is codes codes stands
65. 2:35for the combined DNA identification
66. 2:37system it was officially activated in
67. 2:39October
68. 2:401998 allowing participating forensic
69. 2:43Laboratories to compare DNA profile with
70. 2:45the goal of matching a case evidence to
71. 2:47other previously unrelated case or to
72. 2:50person will already convicted specific
73. 2:53crime although the codes proved its
74. 2:55importance some people oppose it saying
75. 2:57that the indexes will include the DNA
76. 2:59profiles of inoc and individuals
77. 3:01violating the right to privacy there's
78. 3:03also a risk associated with the combin
79. 3:05DNA identification system which occurs
80. 3:08if the combined DNA identification
81. 3:09system contains profiles that are
82. 3:11inaccurate incomplete or unallowable in
83. 3:14this case the database is less useful to
84. 3:16the criminal justice system addition to
85. 3:18convicting criminals DNA fingerprinting
86. 3:20has been used to free wrongfully
87. 3:22convicted people in 1984 Daryl hunt was
88. 3:25sentenced to life in prison for raping
89. 3:27and murdering the boras SS of Winston
90. 3:29sale he was just 19 years old but he was
91. 3:32also African-American and Sykes was
92. 3:34white although there was no physical
93. 3:36evidence linked hunt to the crime but
94. 3:38there were claims made by a hotel
95. 3:39employee later proven to be false and he
96. 3:42said that his so hunt entered the hotel
97. 3:45bathroom later that morning and exit
98. 3:47leaving bloody hand tows as well as
99. 3:50other witness who placed hunt near the
100. 3:52scene and that's why he was accused of a
101. 3:54crime that he did not commit he was in
102. 3:57prison for almost 19 years his lawyer
103. 3:59requested a DNA test for him and in 1994
104. 4:03the results came back and his DNA did
105. 4:05not match the SE and found on the
106. 4:06victim's body at the crime scene despite
107. 4:09the results Hunt's appeals were rejected
108. 4:12judges found that the New Evidence did
109. 4:14not prove innocence and he served
110. 4:16another 10 years but finally in 2004 the
111. 4:19DNA profile from the crime scene was run
112. 4:21in the state database at the request of
113. 4:23Hunt's
114. 4:25attorneys results matched a man
115. 4:27incarcerated for another murder of
116. 4:29course without the combined DNA
117. 4:31identification system they wouldn't be
118. 4:33able to match the DNA with the other
119. 4:35Criminal Who truly committed the crime
120. 4:37hunt was exonerated and freed in 2005 in
121. 4:41Daryl's case probably his DNA was
122. 4:43analyzed with the method of short tandem
123. 4:45repeats after his exoneration Daryl
124. 4:48established the Innocence Project as
125. 4:51well as his own group called The Daryl
126. 4:53hunt Project for Freedom and Justice
127. 4:55this project is devoted to educating the
128. 4:58public about flaw
129. 5:00in the criminal justice system
130. 5:02advocating for those wrongfully
131. 5:04incarcerated as a result of those flaws
132. 5:06and providing resources and support for
133. 5:09those trying to rebuild their
134. 5:20lives science has a great impact on our
135. 5:23life it is the answer to everything and
136. 5:26as we as we live we get introduced to
137. 5:29many different developments and
138. 5:30improvements in science that makes our
139. 5:32life easier day by day for the DNA
140. 5:35fingerprint a lot of crimes wouldn't be
141. 5:37solved without it and a lot of people
142. 5:39like Daryl hunt would remain in prison
143. 5:41although they are innocent and for the
144. 5:44combined DNA identification system I
145. 5:46think that it should be provided for
146. 5:48every country to maintain a peaceful
147. 5:58life e