a flexible and effective beanbag platform doreen hudson
TRANSCRIPT
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A Flexible and EffectiveBeanbag Platform
Doreen HudsonSupervising Criminalist
Los Angeles Police Department
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LAPD 5-45 Beanbag Platform
Policy
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The Platform Is More Than Ammo
•Firearm–Remington 870 Rifled Barrel
•Ammunition–CTS Model LAPD 2588
•Policy–Bellybutton aimpoint–Standoff range 5 ft to 45 ft
1 2 3 4 5
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Spanning the Less Lethal Gap
0 ft
21 ftTASER
12 ftOC Spray
30 ft
45 ftLAPD 5-45 Beanbag Platform
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Prompted by Performance Problems
•LAPD began using 12 gauge foldedbeanbags in 1995 with success andfailure–Low velocity projectiles didn’t work –no effect–Some bags never cleared the barrel–Some penetrated–Performance unpredictable–Most bags did not open even at range
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Lethal Penetrations Focused Attention•Bean bags perforated tissue and organs at 30 ft•Bags didn’t open up in flight
•cylinder-on point type penetration (impact area <1 square inch, bag is unopened)•wafer type penetration (impact area < 1 square
inch, bag is open, but impact on edge)
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Impact Surface Area Affects Penetration
•Orientation at impact is a function of yaw. Inthese examples the cylinders struck on theirside (impact area > 1 square inch) but wereineffective. Suspect was stopped by a 9mm.•Bag orientation at impact affects penetration
potential
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In Depth Scientific Study•LAPD conducted detailed analysis and testing–Hundreds of test shots and data points–Too much detail for these time constraints
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Square Bag Ammunition
Bag is folded
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Scientific Tests•Intended to capture images of bags in flight
and record useful data–Recording devices included a chronograph, witness
panels, high speed video and a Hadland imagecapture device. 10 shots/test.
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•Rifled barrels have conventionalrifling along the length of thebarrel. The twist on the testbarrel is 1 revolution in 35 inches(1/35).
•Paradox barrels have rifling inthe last few inches at the muzzleend of the barrel.
Rifled and Paradox Barrels Tested
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Smoothbore Square Bag at 40 Feet
Muzzle Velocity =304.0 ft/sec Configuration =
Cylinder-on point
Perforation 1” x 1”
40 feet from muzzle
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Rifled Barrel Square Bag at 40 Feet
Muzzle Velocity =364.9 ft./sec. Configuration =
Open, flat
Perforation 2” x 2”
40 feet from muzzle
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Paradox Barrel Square Bag at 40 Feet
Muzzle Velocity =313.8 ft./sec. Configuration =
Cylinder-on point
Perforation 2” x 2”
40 feet from muzzle
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Properly Deployed Configuration
0
10
20
30
40
50
60
70
80
90
100
Smoothbore RifledParadox
Perc
ent
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Retrofitting with Rifled Barrels•The LAPD converted its less lethal shotguns
to rifled barrels (18 ½ inch barrels with a1/35 twist, 8 lands & grooves)
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•Rifling spins the bean bag; the resultingcentrifugal force opens it reliably•Limited testing showed very good
accuracy at 40 feet–A ten-shot group fromlocked-in-place restwas 6” x 8”
Rifled Barrel
8 inches
6 inches
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Conventional Sock Rounds
•Ballistic gelatinpenetration at 20 feetusing conventionalsock rounds and asmoothbore shotgun
2.5”
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LAPD Custom Sock Ammunition
This beanbag has no seams, and iselongated in the shotshell, but notfolded like the square bag.
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We Wrote Our Own Specification
•By 2001, we knew what wewanted–Sock construction–No tail–325 f/s mean muzzle velocity–Max spread @ 50 ft < 12 “–Minimum impact diameter @
10 ft > 3.5 cms–Pellet penetration < 1 cm if
bag rupture occurs
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Video
•Ballistic Gelatin Impacts at 4 and 2 ft
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Video
•Ballistic Gelatin Impacts at 4 feet
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Video
•Ballistic Gelatin Impacts at 2 feet
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Standoff Distance 7 Feet•Suspect was 5’8” 150
lbs non-compliantschizophrenic•Suspect held hostage
at knifepoint•Suspect was wearing
a thin shirt•Incident justified
lethal force
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Standoff Distance 10 Feet•Suspect was 5’6” 160
lbs non-compliant•Suspect threatened
officers with heavyobject overhead•Suspect was bare
skinned•Suspect submitted to
officers
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Standoff Distance 10 Feet
•Suspect was 5’9” 180 lbs non-compliant(methamphetamine andalcohol)•Suspect sprayed officers
in face with insecticide•Suspect’s arms were
bare skinned•Incident justified lethal
force
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Standoff Distance 12 Feet
•Suspect was 5’6” 160 lbs non-compliant•Suspect was suicidal
and still had knife•Suspect was wearing
a T-shirt and aLetterman’s jacket
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Standoff Distance 30 Feet
•Suspect was 5’0” 150 lbs non-compliant•Suspect had just
committed a rape andwas physicallycombative•Suspect was wearing
a football jersey
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Standoff Distance 30 Feet
•Suspect was 6’0” 160 lbs non-compliant•Suspect was walking
away from officerswhile slicing his wristwith a razor blade•Unauthorized
aimpoint•Suspect was bare
skinned
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Recent LAPD Beanbag Cases Assessed
•Common Elements in forty cases reviewed–Suspects are non-compliant–Suspects pose threat to self, others or officers–25% of cases OC or TASER were used first but
were not effective–25% of suspects were on drugs and/or alcohol–Only one incident resulted in minor injury to
officers (insecticide spray)–No serious injuries to suspects
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Questions?
•Details of study published in:Wound Ballistics Review, Volume 4 Number 4,
Fall 2000, “12 Gauge Beanbag Fatality RiskInvestigation”, MacPherson, D., Hudson, D.,Maruoka, R.
Volume 34, No. 1, Winter 2002, AFTE Journal,Modeling Blunt Trauma from ProjectileImpact, MacPherson, D.•Details of this presentation to be submitted to
Police Chief magazine in 2006