Faking DNA evidence: Case Study Dr. John Schneeberger (born 1961) is a former Canadian physician, who drugged and raped one of his female patients and his stepdaughter. For years, he was able to evade arrest by planting a fake DNA sample inside his own body, thus successfully foiling DNA tests.
On the night of 31 October 1992, Schneeberger sedated his 23-year-old patient, Candice, and raped her. While Versed — the anesthetic he used — has strong amnesiac effect, Candice was still able to remember the rape. She reported the crime to the police.
Scheenburger's blood sample was, however, found not to match the samples of the alleged rapist's semen, thus clearing him of suspicion. In 1993, at the victim's request, the test was repeated, but the result was negative, as well. In 1994, the case was closed.
Candice, still convinced that her reminiscences were true, hired Larry O'Brien, a private detective, to investigate the case. He broke into Schneeberger's car and obtained another DNA sample, which, this time, matched the semen on victim's panties and pants. As a result, third official test was organized. The obtained blood sample was, however, found to be too small and of too poor quality to be useful for analysis.
In 1997, Lisa Schneeberger found out that her husband had repeatedly drugged and raped her 15-year-old daughter from her first marriage. She reported him to the police, which ordered fourth DNA test. This time, multiple samples were taken: blood, mouth swab, and hair follicle. All three matched the rapist's semen.
During his 1999 trial, Schneeberger revealed the method he used to foil the DNA tests. He implanted a 15 cm Penrose drain filled with another man's blood and anticoagulants in his arm. During tests, he tricked the laboratory technician to obtain blood sample from the place the tube was planted.
He was found guilty of sexual assault, of administering a noxious substance, and of obstruction of justice, and received a six-year prison sentence.
(Source: From Wikipedia)
The value of DNA evidence has to be seen in light of recent cases where criminals planted fake DNA samples at crime scenes. In the case above, Dr John Schneeberger planted fake DNA evidence in his own body: Dr. Schneeberger raped his sedated patients and left semen on her underwear. Police drew Schneeberger's blood and compared its DNA against the crime scene semen DNA on three occasions, never showing a match. It turned out that he had surgically inserted a Penrose drain into his arm and filled it with foreign blood and anticoagulants.
A Penrose drain is a surgical device placed in a wound to drain fluid. It consists of a soft rubber tube placed in a wound area to prevent the build up of fluid.
A Penrose drain removes fluid from a wound area. Frequently it is put in place by a surgeon after a procedure is complete to prevent the area from accumulating fluid, such as blood, which could serve as a medium for bacteria to grow in.
An anticoagulant is a substance that prevents coagulation; that is, it stops blood from clotting. A group of pharmaceuticals called anticoagulants can be used in vivo as a medication for thrombotic disorders.
Anticoagulants are given to people to stop thrombosis (blood clotting inappropriately in the blood vessels).
Read more about DNA: Genetic fingerprinting at Wikipedia: DNA Test
raman should not consider himself as a representatives of 100 ngo's when he submitted a memorandum towards 'istana'... he should be happy now coz qariah members who elected the mosque committee and not the AMENO division leaders....
mosque in s'ngor have been 'imarah' in a proper manner under the PR administration... 'khutbah' are more sound than ever and makmum are like before ... stick in the mosque during friday 'solat' just like when be end in power
why now???? during his peak comeback... if i were a student mpp... of course i would like to have connection with the big guns...and i know a friend who like to took picture with politic-celeb( dear friends...i declare TOM as one of those species...Tom jangan marah) but Tom manage to finished his diploma...while this guy... a totally loser drop-out just to get connected, few month from election, few month after election and dont tell me you can go to minister office and get their recommendation for scholarship... i have apply a loan/scholarship before... all i have to do is go to the penghulu office or ADUN or MP to get recommendation...
excuse me laaa...if you dont smell conspiracy here down under
if i were to get the promotion this month... i want to pursue MBA la my wife and kids have to sacrifice a bit of their time during weekends for leisure
KSP should specified a more detailed expenses to be cut down...i think those that related to fuel hike
govt training institution like INTAN, AKMAL or PULAPOL should cut their entertainment for their 'convo-alike'...please no more lavish
please understand the purpose of spending is to benefit all category in the economy-chain...not your 'kengkawan' who will give in return; sport-rims, hotel package for family, cash for children, free maintenance, hamper for family day and the list just go on
PAS with PR
god willing... i will support you as long you remain to core objectives of the party; ISLAM
we're more organised than the other component... please have more demand that will benefit Malaysian Muslim
conratulation .... you'll have free water for the poor