#forensicballistic

[forensicfield]

Handguns:

There are four basic types of handguns: 1. Single-shot pistols 2. Derringers 3. Revolvers 4. Auto-loading pistols (automatics)

1. Single-shot pistols- A single-shot pistol has one firing chamber integral with the barrel, which must be loaded manually each time the weapon is to be fired.

2. Derringers- They are a variant of single-shot pistols. Derringers are small pocket firearms having multiple barrels, each of which is loaded and fired separately. The traditional derringer has two barrels.

3. Revolvers- The revolver is the most common type of handgun in the United States. Revolvers have a revolving cylinder that contains several chambers, each of which holds one cartridge. The cylinder is rotated mechanically so as to align each chamber successively with the barrel and firing pin. The first revolver was produced by Samuel Colt in 1835–1836.

4. Auto-loading pistols (automatics)- Auto-loading or automatic pistols make up the fourth category of handguns. The term “automatic pistol” is a misnomer, as this form of pistol is an auto-loader in which the trigger must be pulled for every shot fired. Regardless of the correct terminology, however, these weapons are invariably called “automatics” or just “pistols.”

[forensicfield]

Fluorescence Examination:: As early as 1933, fluorescence examination with UV light was suggested as a method of visualizing latent prints dusted with anthracene powder on multicolored surfaces (Inbau, 1934, p 4). Before the late 1970s, UV fluorescent powder was used occasionally and appears to have been the only credible fluorescent method of latent print detection. In 1976, researchers at the Xerox Research Centre of Canada discovered inherent latent print fluorescence via continuous wave argon ion laser illumination. Shortly thereafter, the first latent print in a criminal case was identified, using inherent luminescence via laser excitation (fingerprint on black electrical tape) (Menzel and Duff, 1979, p 96). Since the late 1970s, advancements in the technology of fluorescence detection have greatly aided the hunt for many types of forensic evidence. Today, evidence that would be barely perceptible or even invisible under normal lighting is routinely intensified by fluorescence. Bloodstains, semen, bruises, bone fragments, questioned documents, flammable residues, fibers, and fingerprints all merit examination with a forensic light source or laser.

To visualize latent prints via fluorescence, a specific bandwidth of radiation must be shone on either an untreated latent print or one treated with a fluorescent chemical. The wavelengths chosen will be determined by the chemical involved and the luminescent nature of the substrate. The evidence is then examined through viewing goggles or filter plates that block the incident light from the forensic light source. These goggles act as a barrier filter and are fundamental in separating the incident light generated by the light source and the weak fluorescing signal emitted by the latent print. This separation of incident and emitted light signals gives fluorescence examination its sensitivity.

[forensicfield]

Factors that causes changes in Handwriting.

Handwriting is a complicated process. It takes time to develop the coordination of arm, hand and finger movements necessary to write script. It is difficult to change movements quickly in order to create different style letters. Handwriting is also influenced by the physical condition of the writer. Age, disease, medication, drugs, alcohol or stroke can all affect a person’s writing. Conditions that affect handwriting can be temporary (drugs or alcohol), static (paralysis), or progressive (a changing illness). there is a long list of neurological disorders that affect handwriting, some of them are Congenital apraxia, Strephosymbolia, Cerebral hemorrhage/ trauma, Encephalitis, Paralysis agitans, Toxemia/ alcohol, Huntington’s chorea and many more. —————————— #forensic #forensics #forensicscience #forensicfield #forensicballistic #forensicbooks #forensicdocumentexamination #forensicgraphology #graphology #handwriting #documentexamination #questioneddocument #suspecteddocument #forensicstudy #forensicintro #forensicmcq #forgery #forensiclab #calligraphy #criminalistic #criminology #forensiccasestudy https://www.instagram.com/p/B-RDj-uFKRM/?igshid=fiyjhlulqho2

[forensicfield]

Difference between Wound of Entry and Wound of Exit caused by bullet of Rifled Firearm (#Revolver, #Pistol ,#Rifle, etc.) ----------------------------------- ------------------------------ #forensic #forensics #forensicscience #forensicfield #forensicballistic #forensicbooks #forensicdocumentexamination #forensicgraphology #graphology #handwriting #documentexamination #questioneddocument #suspecteddocument #forensicstudy #forensicintro #forensicmcq #forgery #forensiclab #calligraphy #criminalistic #criminology #forensiccasestudy #forensicballistic #ballistic #ballistics #wound https://www.instagram.com/p/B-UwJ4cFyxp/?igshid=1pq5m6ftm9zk4

[forensicfield]

Question- What is Rapid DNA Tests? Answer- Rapid DNA testing is an automated process of quickly creating a DNA profile from a cheek swab sample without any human intervention. Whether the DNA belongs to a deceased victim or a suspect, rapid testing moves the process of solving crime along faster than ever before. In fact, according to the International Biometrics and Identity Association (IBIA) DNA profiles can be available in 75 to 90 minutes. This is especially important considering most suspects are only held for as little as two hours. Rapid DNA testing is proving useful in solving cold cases, as well. The FBI’s Rapid DNA initiative aims search high profile unsolved crimes while a qualifying suspect is processed at a detention center. Pilot testing of this system is set to start in 2019. It can also help verify kinship. According to the Department of Homeland Security, “Additional applications with Customs and Border Protection (CBP) and the Federal Emergency Management Agency (FEMA) are being pursued to counter human trafficking, identify mass casualty victims and to reunite family members.” Before Rapid DNA, results from labs could take up to eight months to get back and required multiple expensive instruments and trained technicians. Rapid DNA makes this process faster and cheaper. Using only a desktop unit that is easily operated, law enforcement offers can still rely on the results. (Like and Follow for more information on forensic science) ---------------------------- #forensic #forensics #forensicscience #forensicfield #forensicballistic #forensicbooks #forensicserology #dna #dnarapidtest #forensicbiology #forensicmcq #forensicquestionandanswer #criminology #crimescene #crimesceneinvestigation #forensicinvestigation #forensicmedicine #forensicstudy #forensicinfo #forensicknowledge https://www.instagram.com/p/CA771B3jOH3/?igshid=5p0m3mq16f26

[forensicfield]

Question- What is Difference Between Forensic Medicine and Forensic Pathology? Answer- Forensic Medicine - “A branch of medicine which deals with the application of principles of medical knowledge for the purpose of law, both civil and criminal, to furthering of the justice”. It also deals with legal aspects of medical practice and doctor patient relationship and medical ethics. Traditionally, it includes pathological anatomy and Forensic Toxicology. Forensic Pathology- The special branch of pathology dealing with the medicolegal investigation of death. A simple comparison of the definitions of two entities have made it clear that Forensic Medicine is more comprehensive subject than Forensic Pathology. --------------------------- #forensics #forensicscience #forensicfield #forensicballistic #forensicbooks #forensic #forensicstudy #forensicbiology #forensicevidence #forensicintro #forensicinvestigation #forensicmedicine #heroin #drug #forensicpathology #criminology #crimescene #crimesceneinvestigation #criminalistic #crimescenemanagement #criminal https://www.instagram.com/p/B-xPqo8DRWa/?igshid=ckkhk644suk1

[forensicfield]

Atomic force microscope–

Atomic force microscopy or scanning force microscopy is a very-high-resolution type of scanning probe microscopy, with demonstrated resolution on the order of fractions of a nanometer, more than 1000 times better than the optical diffraction limit.

Fingerprint- A fingerprint is an impression left by the friction ridges of a human finger. The recovery of partial fingerprints from a crime scene is an important method of forensic science. Moisture and grease on a finger result in fingerprints on surfaces such as glass or metal.

Cartridge case- Cartridge cases are most commonly made of brass, although steel is also widely used, and cases for shotgun pellets are made of brass and cardboard. ————————– #forensic #forensicscience #forensics #forensicfield #forensicballistic #microscope #microscopy #cartridge #cartridgecases #firearms #fingerprints #generalforensicscience #forensicknowledge #gk #fact #crime #legal #law #court #evidence #physicalevidence #traceevidence #forensicphotography #atomicforcemicroscope https://www.instagram.com/p/B0m8_KTla12/?igshid=1m06rns5a1v4c

[forensicfield]

Dates for the Introduction of various calibres From Handbook of Firearms and Ballistics by Brian J. Heard ------------------------ #forensics #forensicstudy #forensicscience #forensicandcriminology #forensicballistic #calibre #bullet #gun #firearm #ballistic #forensicintro #forensicknowledge #history #historyofballistic #datesbackcalibre #crimescene #criminalistics #criminology #crime #forensic https://www.instagram.com/p/B2nmkkCha-1/?igshid=9p6vqz1muvzr