Luminal Used In Crime Scene Investigations

As a crime scene investigator it is their job to collect all of the evidence in a timely manner. Although, there are ways to collect the evidence it is very important to make sure that the evidence is collected correctly and properly. Now as a crime scene investigator I have arrived on a crime scene where there is a lot of evidence that needs to be collected. All of the evidence that needs to be collect for the case is drying blood on the floor, a hand gun, several shell casings near the victim, and some hairs that is still in the deceased victim’s hand. Therefore, I would start by taking pictures of the entire crime scene to ensure that everything is documented as it was found before I start to remove any of the evidence. Furthermore, I would ensure that I am at all times wearing latex gloves so that I don’t leave my own finger

Any moist or wet biological evidence (blood, body fluids, plants, etc.) like the lottery ticket on the counter with the blood smeared print on it should be collected wearing gloves it should then be placed in a clean unused paper container such an envelope, and or small bag and transported back to an evidence receiving area, it should then be taken out of the bag and allowed to air dry thoroughly. The Ninhydrin process should be applied to this piece of evidence to obtain noticeable prints.

Forensic science is a key aspect of Criminal Justice that helps rid the streets of lunatics and murderers. One of the most important fields of forensic science is blood spatter analysis. Under the Crime Scene Investigation, analysts gather the information that could eventually lead to a victim’s killer. Basic and complex information can be found when analyzing blood. We can learn what kind of weapon was used, the time of death of a victim and other important facts that can help a case. The pattern that the blood gives off give forensic scientists the tools that they need to help solve cases.

Luminol is most well-known for its use in forensic science. Luminol, a base, and an oxidizing agent in solution together will create a blue light in

This certain reaction is a “redox reaction” or a reduction/oxidation reaction. A redox reaction is any chemical reaction when a molecule, atom or ion gains or looses an electron. The chemical reaction for glow sticks is as follows:

Hollywood holds a notorious reputation for exaggerating scenes of criminal investigation with the intention to evoke drama for the viewer (Saferstein, 2015, p. 5). From the identification of evidence, to the handling etiquette of crime scenes – the exaggeration of various criminal investigation procedures has lead to the formation of an idealized image of forensic analysis (FA) in the public eye. It is an image that is arguably emotionally stimulating, but nonetheless, heavily inaccurate. Amongst all of the various fields of FA, Bloodstain Pattern Analysis (BPA) is arguably one of the most inaccurately portrayed types of FA in Hollywood films. This includes the duration of the process, the measuring methods of patterns, the classification

HMECs and MDA-MV-231 cells will be plated 1 x 103 cells/well in 96-well plates and cultured overnight (16-18 h). On the following day, test compounds will be diluted in growth medium to the desired final concentration and then added to the cells. After 3-4 days of incubation, CellTiter-Gloc Reagent will be added and mixed. The plates will then be incubated for 10 minutes to stabilize the luminescent signal then read on a luminometer plate reader at 560 nm. GI50 values can be determined from semilog plots of percent of control versus concentration (14, 36). The normal HMBCs will serve as a control cell line to gauge the effect of the compounds in normal tissue. This homogenous assay “add-mix-measure” format results in cell lysis and generation

Crime scenes tell a story. Whether it is a long story with a lot of evidence, or if it’s a short story with a lot of information missing can be determined on how you use what you see. In traditional crime scenes investigators rely heavily on fingerprints and DNA found at the crime scene. Each can be useful but also has their faults. When it comes to fingerprints, you may not get a full print, it could only be a partial or even an individual who is not in the system. Most fingerprints found at crime scenes are only smears making them worthless. DNA samples can be extremely beneficial, but only if you get lucky. I say this because it is so much that could go wrong while trying to obtain information from a DNA sample. The body could have already

Blood is one of the most important evidence that can be found at the crime scene since violence always happens in the criminal event. The search of blood is mostly done by close observation of investigators, however, sometimes blood in the crime scene will be wiped out by the murderer, or, sometimes the amount of blood will be too little to be observed without the assistance of other substance. For this kind of situation, luminol can be used in order to help criminalists to detect blood in the crime scene.

The degradation of a crime scene will happen, to a degree, as soon as the responding patrol officer enters the primary crime scene. Since the first responding officer had to check the victim for wounds and rule out medical attention, possible trace evidence on the floor could be compromised or lost. Next, the first responder had to secure the scene ensuring the suspect was no longer in the apartment at which time the officer’s fingerprints, hair, and DNA could now be contaminating the crime scene. Moreover, the paramedics have touched the body and possibly moved her from her original state rendering it impossible to know the exact pose of the body. Also, the numerous uniformed police officers walking about the crime scene allowed for more unintentional

The advantage of luminol is that in low concentrations it is safe to use and it’s said to be more sensitive than other luminol preparation. However the disadvantages of luminol is that it can take too long to prepare and it doesn’t appear long enough for photos to be taken therefore it will require multiple sprays however this can dilute the possible blood and make the sample unusable.

Glow sticks contain two separate sections inside them. Both sections contain two different chemical solutions. When broken, the hydrogen peroxide solution mixes with diphenyl oxalate. The diphenyl oxalate is then oxidised by the hydrogen peroxide which then produces dioxetanedione. When this happen, the chemical dioxetanedione releases enough energy to excite the electrons in the fluorescent dye to a excited state. When this process happens, it is called chemiluminescence which also releases or emits photons. In chemiluminescence, when the electrons go to a higher energy orbital then coming back down to its original, the glow stick is releasing electromagnetic radiation. There is a certain wavelength that is being released which is visible

It makes its tail glow using bioluminescence which is a chemical reaction between a chemical the glow worm makes called luciferin mixes with air. That chemical reaction gives off light.

this was a means of using the luminosity at night to show the way as a means of light, for this

Essentially, this is the name given to a device producing light that meets three qualifications. The first is that the light produced is completely in phase, meaning all crests and troughs in the waves line up perfectly, leading to only constructive interference. Next, all of the light produced is propagating in the exact same direction and not spreading out. Finally, all of the light is all the same color, and thus the same frequency. This indicates that all of the light is of the same energy, since the energy of light is proportional to its frequency. These devices are able to achieve such remarkable properties through a physical process known as stimulated emission of radiation, the basis for their name [1].