Hi,
I was playing a criminal investigation game earlier this week, and at one point I had to spray luminol all over a room to test for a reaction. Prior to the investigation a man was stabbed and shot by a masked assailant. Security footage clearly showed the culprit dragging the victim's body out of the room, leaving a trail of blood behind. However during the investigation, luminol tests yielded no results. There's no room-switching trick or any tampering done to the security footage, so I am curious as to how this is possible.
My question is how can one completely erase traces of blood such that the luminol will show no reaction when it is sprayed?
This is a DIGITAL forensics forum not a WET forensics forum. Try somewhere else?
My question is how can one completely erase traces of blood such that the luminol will show no reaction when it is sprayed?
Wrong question, I'm afraid.
A more appropriate question is probably why you're asking a question about presumptive blood testing in a forum on computer forensics? Even if the film showed someone bludgeoning the victim with a Osborne-1, I'm sure we would only be interested in why anyone would maltreat a musem piece in such irresponsible manner.
But regardless, you have asked the wrong question. You need to take at least one big step back.
If the question would be if a video could by edited / altered in such a way, that would be a digital forensic question.
To answer myself, such manipulations depend on many factors unknown to us - so the answer is maybe ?!
There's no room-switching trick or any tampering done to the security footage, so I am curious as to how this is possible.
Maybe there was some actual tampering with the security footage, after all, and after all, if this is the case you are on the right forum …
Anyway the answer to the original question is probably oxigen based bleach.
jaclaz
This is a DIGITAL forensics forum not a WET forensics forum. Try somewhere else?
I apologise. I was just super curious about my question so I googled "forensics forum" and decided to post in the first link it gave me.
Furthermore I have absolutely no experience with forensics so I have no idea what "wet" and"digital" forensics mean, let alone know that such a distinction exists between the two terms. I was under the impression that anything to do with crime is forensics and that there weren't any more specific categories.
There's no room-switching trick or any tampering done to the security footage, so I am curious as to how this is possible.
Maybe there was some actual tampering with the security footage, after all, and after all, if this is the case you are on the right forum …
Anyway the answer to the original question is probably oxigen based bleach.
jaclaz
Since the crime took place in a school, it would be safe to assume that bleach is available to the cleaners. I now have a good idea of who the culprit is.
Thank you very much for your response.
My question is how can one completely erase traces of blood such that the luminol will show no reaction when it is sprayed?
Wrong question, I'm afraid.
A more appropriate question is probably why you're asking a question about presumptive blood testing in a forum on computer forensics? Even if the film showed someone bludgeoning the victim with a Osborne-1, I'm sure we would only be interested in why anyone would maltreat a musem piece in such irresponsible manner.
But regardless, you have asked the wrong question. You need to take at least one big step back.
Sorry about that. I just went up and searched "forensics forum" in a bid to have my question answered as soon as possible.
It may seem obvious but as a student who was playing a game, I did not have any knowledge at all of what "wet" and "digital" forensics mean. It was just a game after all, so I suppose the creators didn't expect any of the players to have any in-depth knowledge of criminal forensics in order to enjoy it.
Why use Luminol, not Acid yellow or Acid black ?
Wrong forum though, as previous users have said.
Since the crime took place in a school, it would be safe to assume that bleach is available to the cleaners. I now have a good idea of who the culprit is.
Thank you very much for your response.
Hmmm.
Not really.
Oxigen based bleach is not an everyday cleaning product, I would guess that 99% of school janitors/cleaners only have the more common chlorine bleach readily available.
If it was a laundry, availability of oxigen based bleach would have been more probable.
jaclaz