avesdoesthings

[avesdoesthings]

Blood in Forensic Science!

Bloodstain Pattern Analysis, also known as BPA, is a forensics method that involves analysing bloodstains left at crime scenes.

Four things that BPA can determine include;

Anything about the surface texture.

Dropping distance.

The angle of impact.

Types of spatter.

Satellite spatters are small droplets of blood that are distributed around the perimeter of a drop(s) of blood and were a result of the blood impact against the surface it fell on.

The impact angle of blood on a flat surface can be determined by measuring the degree of circular distortion. The formula for this is as follows;

Sin A= (Width of bloodstain)/ Length of bloodstain (where A is the angle of impact)

The length of the bloodstain should always be longer than the width, and you should take great precautions in measuring it with a ruler or micrometre.

In general, bloodstain diameter increases as height increases.

Blood spatter is defined as a random distribution of bloodstain that varies in size, shape and could even be caused by different mechanisms.

Forward spatter is projected away from the source (outward) and usually from an exit wound.

Back spatter is blood projected back from a source, usually an entrance wound and potentially onto the person who created the impact.

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If you enjoyed or learned anything from my very short explanation of BPA, likes and reblogs are always appreciated. If you have any suggestions on what other forensics methods, chemistry topics or job opportunities within forensic science or chemistry that you'd like me to write about, please don't be afraid to ask!

All of my information is summarised from different forensics books, websites and articles, which are reliable sources and won't give you any false claims or biased opinions.

Thank you so much for reading! Xx

-Aves