AFIS stands for Automated Fingerprint Identification System, and it is a biometrics system for automated fingerprint identification; the system consists of a database of fingerprint images used for criminal identification purposes, and is used worldwide. A very simple definition of a fingerprint impression is any impression of, or left by, the friction ridge skin of […]Read More A guide to Automated Fingerprint Systems, and information on how AFIS works
How do police develop, and collect, footprint and tire track impressions – and how do they perform forensic examinations on the impressions? Much like fingerprint impressions, footwear and tire impressions can be deposited on just about any surface; and just like fingerprint impressions, they fall into three basic categories. Visible (patent), latent, and plastic. Impressions […]Read More Footprints and tire tracks, how do police match them to a suspect?
Scams, by phone, via social media, and by email, are more common than you might think, and unfortunately, many folks fall for them. Here is the latest to be reported in my town – this one is a computer scam, and it starts by sending you a pop-up message stating that your CPU is infected […]Read More How to avoid telephone and computer scams; and some scams explained.
Identifying fingerprints is done almost at the touch of a button – at least that’s how it seems from watching TV. In real life, fingerprint comparisons can be a complex process, and quite difficult at times. The ability to accurately identify recovered fingerprints is critical in law enforcement, as a matter of fact, it’s invaluable. […]Read More Identifying latent fingerprints; a basic look at how police match fingerprints from a crime scene.
Touch DNA”, or “contact DNA”, refers to DNA samples that are deposited on a surface, or on an object, by touch or by contact. I’ve had good luck with touch DNA recovery from pistol triggers, abandoned gloves or ski masks, and once from the earpiece of a telephone. Some investigators have successfully submitted samples from […]Read More What is Touch DNA, and how is it collected ? A basic look
We all know of the saying “A picture is worth a thousand words.” Now with modern digital photography, it could easily read “A picture is worth a thousand lies.” What happens in the law enforcement world when a person can spend a couple of hundred dollars to buy a computer program allowing them to manipulate […]Read More The use of Photoshop to commit fraud
The Sig P365, 9mm sub-compact, takes a frame and slide that are either the same size or SMALLER than that of the Glock 43 (a single-stack gun) and adds 4 rounds to it. And it does it in a way that is more comfortable to hold and has a better trigger. Add the extended magazine, […]Read More Gun Review: Sig Sauer 365
Scammers are out to make a profit by exploiting health issues, and by taking advantage of fears surrounding the Coronavirus. They’re making phone calls, and setting up websites to sell bogus products. They set up fake sites that look official, then send emails, offering you tests, masks, cures, you name it. The emails and social […]Read More Avoiding Coronavirus Scams
As a police recruit in 1988, the sound of racking a round into shotgun in training had our class of 44 students all paying attention. We practiced with it, loaded and unloaded it until you could do it flawlessly. We did building clearing sceneries, felony stop scenarios, and answered simulated calls, and a Remington 870 […]Read More The shotgun in police service
My agency worked a double murder last week, and I got involved in a discussion about Gun Shot Residue tests, or GSR tests, which made me realize that many officers have not the slightest clue about how one is done, or what it really involves, they just know “it would tell you if you shot […]Read More Gunshot Residue Collection and Forensic Examination
Modern American blood-spatter analysis didn’t originate in a crime laboratory, It started decades before the masterful Dexter, of TV fame, in Corning, New York, in Herbert MacDonell’s basement. MacDonell was a chemist, but he always forensics, and came up with the concept of magnet fingerprint powder, and invented the magnet fingerprint brush. His love for […]Read More Blood Spatter Interpretation, and how it is used in police investigations.
A very simple definition of a fingerprint impression is any impression of, or left by, the friction ridge skin of a finger or thumb. Friction ridges are the ridges and furrows that are on the pads of the fingers and thumbs. They are there to provide grip, hence the name friction ridges. Almost everyone has […]Read More How Police Search For Fingerprints at a Crime Scene, and how they are matched
Crime Scene and Major Criminal InvestigationsRead More Processing a Major Crime Scene – Police Procedures