You should have back: • No hiding Blood reading questions- stamp • Blood probability problems- stamp • Animal blood comparison- 25 points • Blood detection lab- 20 points • Blood basics notes- 20 points • Intro to Serology quiz- 14 points • Killing Room video organizer Today is the LAST DAY to turn in Blood punnetts and Blood typing lab
Today’s assignments • Finish up and turn in the Blood spatter technology assignment • Then start and finish Blood spatter lab #1
Today’s assignments • Killing Room Video Organizer • Complete Serology Unit Quiz 1 • Then complete and turn in the Bloodstain pattern Technology assignment (on computer cart) • Due today: Blood typing lab & Blood punnetts
Websites to use for Blood pattern technology assignment • http://www.bloodspatter.com/bloodstain-tutorial • http://science.howstuffworks.com/bloodstain-pattern-analysis2.htm • http://projects.nfstc.org/gallery/main.php?g2_itemId=3857 • http://dsc.discovery.com/life/csi-knowledge-how-bloodstain-pattern-analysis-works-infographic.html
Forensic Files #5 There’s been a possible mixup at the hospital! Baby 1 (with A blood type)has been sent home with Mr. & Mrs. Artery who both have A blood type. Mr. & Mrs. Vein (Mr: AB; Mrs: AB) have been sent home with Baby 2 who has O blood type. Which baby belongs to which couple??? Prove with Punnett
Bloodstain Terminology • Angle of impact--angle at which blood strikes a target surface. • Bloodstain transfer--When a bloody object comes into contact with a surface and leaves a patterned blood image on the surface. • Backspatter--blood that is directed back toward its source of energy. Cast-off--blood that is thrown from an object in motion
Bloodstain Terminology • Contact stain--general term referring to bloodstains caused by contact between a wet, blood-bearing surface and a second surface which may or may not have blood on it • Transfer--image is recognizable and may be identifiable with a particular object • Swipe--wet blood is transferred to a surface which did not first have blood on it • Wipe--a non-blood bearing object moves through a wet bloodstain, altering the appearance of the original stain
Bloodstain Terminology • Directionality--relates to the direction a drop of blood traveled in space from its point of origin • Terminal velocity--the greatest speed to which a free falling drop of blood can accelerate in air. It is dependent upon the acceleration of gravity and the friction of the air against the blood--approximately 25:1 feet/second. • High velocity--greater than 100 feet per second; gives a fine mist appearance • Low velocity--5 feet per second or less • Medium velocity--5 to 25 feet per second.