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  • BloodTips-04 Hemastix Blood Test Strips

    By: Administrator
    Chemical field testing for blood using "presumptive" methods as long been practiced by crime scene investigators. Granted, many of the red to reddish brown stains found at crimes scenes are “obviously blood,” and presumptive testing may be eliminated. By Don Penven Chemical field testing for blood using “presumptive" methods has long been practiced by Hemastix Strips crime scene investigators. Granted, many of the red to reddish brown stains found at crimes scenes are “obviously...
  • Bullet Holes in Plastic-Composite Material

    By: Administrator
    (Crime Scene Investigator Network) Bullet Holes in Plastic and Steel by Sgt. Jim Davidsaver, Lincoln Police Department Abstract When investigating crimes involving gunshots and bullet holes, crime scene technicians must be cognizant of holes and defects in rubberized plastic-composite materials used in most new cars' bumpers, fascias and guard strips and investigate accordingly to determine if the damage was caused by a bullet. Accurate measurements of well-formed bullet holes are necessary...
  • BloodTips-02 Dischaps Reagents

    By: Administrator
    Blood DISCHAPS™ applications rely on using the contact method of testing—that is, a few drops of distilled water are placed on a strip of filter paper, and the wet filter paper is pressed against the suspected stain. The DISCHAPS™ reagent is then applied to the filter paper, thus preserving the original evidence stain. By: Don Penven Note: Dischaps is the name of a product line manufactured by Sirchie Finger Print Laboratories. It refers to the type of packaging for a series of different...
  • CasTips03 – Recovering Dust Impressions

    By: Administrator
    Dust impressions are fragile at best, so the utmost care must be taken when attempting to lift them. Some methods work better than others By: Don Penven Methods for Lifting Dust Print Impressions Dust impressions are fragile at best, so the utmost care must be taken when attempting to lift them. Some methods work better than others, so it is suggested that you make several trial runs before going after the real thing. Using adhesive materials to lift dust prints. Prior to the invention of the...
  • Latent Print Comparison—The ACE-V Method-Part 9

    By: Administrator
    Latent fingerprint experts use a system known as ACE-V when making fingerprint comparisons. The following was extracted from an article published on www.clpex.com Written & Compiled By: Thomas J. Ferriola Identification Technician Sebastian Police Department, Florida  Level One  ( Ridge Flow & Class Characteristics) is the largest scale of information, such as the general type of the central area of the fingerprint, such as an arch, whorl, or loop. Other level one details may include...
  • Detectives use toilet paper roll to link man to pizza shop robbery

    By: Administrator
    By Liz Zemba, http://triblive.com/ A threatening note penned on toilet paper helped unravel a robbery attempt at a Uniontown pizza shop, according to police. Eric W. Frey, 29, of Uniontown is charged with walking into Michael Maria's Pizza on East Fayette Street shortly before 8 p.m. Saturday and handing an employee a note handwritten in black ink on a scrap of toilet paper, police said. Toilet Paper Evidence The note read, “I have a gun. Give me $300,” according to court documents. Frey...
  • Grants: Increase Your Chances of Success

    By: Jocelyne Terilli
    Grants, from a variety of places, can become an extra supply of finances that law enforcement agencies often need. However, the idea of finding a grant proposal, reviewing its requirements, writing a proposal and submitting it sounds incredibly daunting to many first-time grant writers. To make it easier for you, we’ve outlined three rules to be successful in writing grants: Follow Directions. Grant proposal requirements are often extremely specific, such as it has to be in 12-point font and...
  • Latent Fingerprints—Preparing for Courtroom Challenges

    By: Administrator
    Quite often, fingerprint identifications are challenged in court—despite the fact that fingerprints have been the primary means of identification for the past 100 years. Complied by Don Penven Terrorist Bombing in Madrid  In March 11, 2004, terrorists bombed several trains in Madrid, Spain, killing 191 people and injuring more than 1,800. A few days later the Spanish police sent a latent fingerprint electronically to the FBI’s Latent Print Unit (LPU). The LPU identified the latent print...
  • BloodTips-03 Luminol Reagent

    By: Administrator
    Luminol is a substance that is used as a presumptive test for the presence of blood. Making use of the peroxidase-like activity of the heme portion of hemoglobin, Luminol produces a bluish-white light that can be viewed in total darkness. By: Don Penven Luminol is a chemiluminescent substance that is used as a presumptive test for the presence of blood. Making use of the peroxidase-like activity of the heme portion of hemoglobin, Luminol produces a bluish-white light that can be viewed in total...
  • BloodTips-01 Introduction to On-Scene Identification of Blood

    By: Administrator
    The purpose of BloodTips is to provide quick tutorials in the use of the most frequently used Blood Spatter blood screening methods at crime scenes. These tests are PRESUMPTIVE in nature. They, like narcotic and drug field tests, serve a singular purpose—they provide the crime scene investigator with the knowledge that a particular stain possesses the possibility that it is blood, and these tests are not a substitute for crime laboratory analysis. By: Don Penven The purpose of BloodTips is...
  • Choosing the right trauma kit

    By: Jocelyne Terilli
    Injuries happen quickly and without warning. When they do, you want something at hand so you can command the scene and treat the injured person until they receive medical attention. There’s a couple of different names for them: First Aid Kit, Trauma Kit, or Medical Bag. It sounds confusing about how each one is different and which one you need, but we’re here to help. Our trauma kits are created specifically for law enforcement and military personnel and we’ve reviewed our top three...
  • Developing Latent Prints from Gloves

    By: Administrator
    Latent Print Daniel J. Rinehart/Crime Scene Investigator Network Case #1: Developing and Identifying a Latent Print Recovered from a Piece of Latex Glove Using Ninhydrin-Heptane Carrier Developing suitable ridge detail on the interior side of surgical type gloves is infrequent and identifying recovered ridge detail is even more unusual. Thanks to the research and publication of the work done by Jason Pressly of the Mississippi Crime Laboratory, I had the benefit of having another option in...
  • Three Sirchie Solutions You Need in Your Classroom Today

    By: Jocelyne Terilli
    New uses for technology find their way into the public safety industry all the time. To prepare your students for the professional world, programs that highlight and give students hands-on experience with technology used in the field set themselves apart. We offer three solutions to help you enhance your criminal justice, forensics, and other related programs: Affordable Live Scan Systems to demonstrate current identification and biometric practices Thermal Imaging Cameras to help see the...
  • Arson Scene Investigation Procedure-Part B

    By: Administrator
    Arson annual property losses amount to more than $1 Billion and the number of arson-caused deaths are nearly 500 each year. Arson Scene Investigation Procedure- Part B By: Don Penven, Technical Support Group Introduction According to statistics published by the National Fire Incident Reporting System (NFIRS), an average of 267,000 fires per year are the result of arson. Annual property losses amount to more than $1 Billion and the number of arson-caused deaths are nearly 500 each year. The...
  • CasTips05 – Toolmark-Bite Mark Recovery

    By: Administrator
    Toolmarks are frequently apparent at points of entry occurring during a burglary, but this form of impression evidence covers a number of other 3-dimensional impressions uncovered at crime scenes—most notably—bites marks. By: Don Penven Recovering toolmark impression evidence can be a valuable contribution toward successful prosecutions—if it is done properly. Toolmarks are frequently apparent at points of entry occurring during a burglary, but this form of impression evidence covers a...