''Forensics'' Blood Stain Patterns

2011-12-07T22:43:00.000-08:00

In 1955, the first meaningful achievement of bloodstain evidence was credited to Dr. Paul Kirk of the University of California at Berkeley (Nordby).

First of all, blood contains a fluid portion we call plasma. Plasma contains natural segments of erythrocytes, leukocytes, and platelets. The nuclei of the leukocyte (white blood cells) are our source to DNA evidence. Furthermore, blood is similar to common fluids however, blood is held together by powerful cohesive molecular forces that generate a surface tension within each drop and on an external surface (Nordby).

Moreover, surface tension is a great way to determine the characteristics of bloodstain patterns. For instance, if a single drop of blood fell vertically on a nonporous surface there would be little to no spatter. In contrast, if the blood fell vertically on a porous or rough surface nine times out of ten there will be a significant amount of spatter. The geometry of determining an individual bloodstain pattern can be very complex. The direction of travel, area of origin and angle of impact are important factors in reference to determining the area of convergence to blood stain patterns (Nordby).

Not to mention, bloodstain spatters vary in size. After identifying bloodstain spatters; gathering medical, scene, and case related evidence; determining the mechanism category becomes easier for the analyst to establish specifics. Categories of blood spatters are based on the mechanisms. Such as:

Secondary mechanisms Impact mechanisms Projection mechanisms

Satellite Spatter *Gunshot *Cast off

*Beating/Stabbing *Arterial

*Power tools/etc. *Expirated

Furthermore, arterial punctures can produce very large quantities of blood. When an artery is punctured it is usually obvious. This is because; arterial punctures varying from large gushing or spraying patterns to small spray patterns are obvious. Like, if an individual was stabbed in the neck and an artery was punctured this type of injury would result in a large amount of spraying or gushing from the body; developing obvious patterns of an arterial spurt (Nordby).

Lastly, transfer bloodstain patterns are when an object wet comes in contact or whipping with an unstained object or secondary surface. Transfer patterns can be a very useful part of solving an investigation. If a suspect dropped a knife used in a murder in the woods and it was recovered and if trace evidence were found, the evidence can be examined to rule out the suspect involved (Nordby).

Kiddie Saftey

2011-12-07T10:45:00.000-08:00

First and foremost, being a mother can be a very challenging title. Especially, when it comes to having more than one child. As a mother of 4 children ages 9,6, 1 1/2 and 5 months it can be very difficult to watch every child's every move, ''If you know what I mean''. Furthermore, with a husband who sleeps all day long from working the night shift isn't any help either. Granted he makes the money it would be a hell of a lot easier for me if we could switch titles, "Yeah Right". I seriously don't think a man could handle a woman's title and tasks on any good day let alone a bad one. Personally, I think any man would give up if not kiss our feet for the guilt that comes upon them after they realize our complaining is for a legitimate reason, lol. However, we all know how challenging our lives can be on a daily basis with children. So, I have thought of some helpful ideas on occupying a child's mind while your busy. Some of these things make it a lot easier on everyone in the household. Moreover, take interest in what your child's favorite activities are. This way; if your busy and your child is following you all over the house you can sit them down with what they like to do most, take a deep breath and continue what you were doing. If your busy in the kitchen and your child is up your rear-end sit them at the table with a coloring book and some crayons, a board game, or something you know they like to do. This way; your child is visibly in your sight and you don't have to keep running back and fourth from the kitchen to the living room worried, whether they're getting into something or not. Always make a task sound fun this way you don't have to worry about them telling you "No I don't like this,'' "No I don't want to do this" or "I'm board or this is boring." Safety is a big thing for me I have heard of some terrible incidents happening with children which makes me even more protective as a parent. My husband says I go a little over board but whatever these are my thoughts and ways of ensuring my child's safety. If some parents didn't give up so to say and were watching their child then nine times out of ten they wouldn't have fallen down a flight of stairs; the dresser wouldn't have feel on top of them; they wouldn't opened the car door while the car was driving; or got out of the back door and got bit by a dog or kidnapped. Every child needs to know they have security. This is because; they don't really know a feeling otherwise. I believe if you take time to find what your child really wants, occupying their mind with that will help you and the family, especially when your cooking dinner. If your a stay at home Mom or full-time student like me I recommend taking showers while their napping ''its a lot easier,'' ''Trust Me.''

Kiddie Safety

''Forensics'' Blood Stain Patterns

Kiddie Saftey