Faking DNA evidence: Case Study

maverickysm | ...... 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).... selanjutnya.