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By A. Gallop

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Sample text

W h e n shifting the source for d e t e r m i n i n g velocity, the logic c h a n g e d to assumptions which weaken the evidence. Velocity as the key to identification of whole groups of spatters requires that the source be assumed before the pattern can be labeled. T h e revised a p p r o a c h deleted evidence from the initial consideration, a n d thus, b e c a m e a subjective approach. T h e assumed dynamics on occasion also has ignored o t h e r n o n c r i m i n a l events, such as blood dripping into blood a n d respiratory distribution.

Only if the external C is equal to the internal can we calculate the incident angle by measuring the stain. Most instructors answer questions of disparity in size by claiming that proportionality remains the same. This may justify the procE ess but no specific study has been found that shows that there really is proportionality. Advocates of the technique claim that since the ellipse is completed based on the initial contact angle location, the angle would be the same at the lower end of the duplicated curvature.

2. Select the right stains to measurement: a. Visible with the unaided eye. Don't include something you can't see without magnification for an area of convergence, nor should they be used for angle determinations. b. Oval with distortion end, tear drop, tadpole, etc. Stain must have direction of travel consistent with area of convergence. c. Consistent with other stains selected to measure. d. All on one type of surface. e. Direction of travel is in the direction of the greatest edge distortion (not necessarily the longest measurement).

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