blood stain analysis

Cast off pattern

circular and elliptical stains; spatter; linear arrangement, impact angles decrease (stains get more elliptical), directional angles consistent (stains oriented same direction)

Drip pattern

non-spatter; irregular margins (look at the semicircular edges from the drips – these not always present), parent stain surrounded by satellite; satellite stains relatively consistent in size shape (small, circular, elliptical stains) – this part is most diagnostic

Transfer (Pattern transfer)

Non spatter; regular margins that have a recognizable shape; contact between a bloody surface and another surface, no or negligible indications of motion; non uniform distribution across the pattern

Splash pattern

non-spatter; irregular margins (scalloped edges) parent stain surrounded by satellite

stains; in this case – the satellite stains contain varied shapes, but long, thin elliptical

stains, indicative of increased energy of impact – this part is most diagnostic and in this case differentiates it from the drip pattern in #2.

Drip

According to BG, spatter (circular or elliptical stain); look at scale for size; larger than 4mm; circular in shape, see sub mm satellite spatter either due to surface or energy or both; single bloodstain

Projected pattern

Spatter stains, large elliptical stains with volume (and flows); compositely deposited; curvilinear, sinuous in shape; have actually 2 depositions here, likely position change or pressure or combination

satellite stain

A smaller bloodstain that originated during the formation of the parent stain as a result of blood impacting a surface.

accompanying drop

A small blood drop produced as a by-product of drop formation.

backsplatter pattern

A bloodstain pattern resulting from blood drops which can be produced when a projectile creates an entrance wound.

saturation stain

A bloodstain resulting from the accumulation of liquid blood in an absorbent material