Blog

0 comments

Category:

mobile_photo
After much ado and late hours in the lab crunching numbers, PSI has completed its Ballistic Trajectory Study and Analysis. Conceived to test a working theory I first used in a capital punishment case in 2010, this study aimed to determine just how accurately could we predict a shooters location when multiple rounds were fired and their impact sites were available for analysis. In many of our cases, the shooter fires more than one round and it seemed clear in analyzing the data in these cases that there was a benefit to looking at the shot pattern as a whole, as opposed to using each shot individually.

View Post

0 comments

Category:

mobile_photo
We had been working on this case for over 5 years by the time trial finally became a reality. The 5 years had been spent in painstakingly poring over every witness statement and every possible piece of physical evidence. No expense had been spared in retaining and using experts from a dozen areas of expertise. Technology was brought to bear at a level I have never before seen and used to explore even the most subtle of analyses. The plaintiff’s attorney was up against attorneys from the state, the county and the city in which the accident occurred, setting the stage for an epic battle a la “David versus Goliath”.

View Post

0 comments

Category:

mobile_photo
3D Laser Scanning – Determining & Illustrating Driver Eye View Obstructions: In the reconstruction of vehicle accidents, particularly vehicle versus pedestrian cases, one of the issues that often arises is the portion of the scene that the pedestrian was visible to the driver in the moments immediately before impact. A common point of analysis is the so-called “Last Chance to Avoid” point for the driver of the vehicle. How much of the pedestrian, or other vehicle, was visible to the driver at this last chance point and position?

View Post

0 comments

Category:

mobile_photo
3D Laser Scanning – Downstream Benefits for Complex Litigation - At PSI, our method in analyzing complex crime and accident cases starts with creating the 3D Working Model. By combining an accurate 3D model of the environment, vehicles and actors with the available physical evidence, PSI uses the precision of the computer to virtually reconstruct the events.

View Post

0 comments

Caught in the Act!

Mar 05, 2015

Category:

mobile_photo
A young woman crosses a busy street in San Francisco in broad daylight to catch her waiting bus on the other side of the street. Her path is interrupted by a MUNI bus that moments earlier was stationary at a red light. Her encounter with the bus results in much more than missing her ride – she suffers a double amputation of her legs. The dozens of witnesses serve up as many differing accounts of what occurred, providing little in the way of useful data for reconstruction. The bus driver insists he never saw the young woman until impact. She herself does not remember the specifics and is not sure how she ended up on the ground under the bus. There is a witness to the event however who sees and remembers everything seen in detail. This witness sees the event from multiple vantage points and can recall the event in exacting detail years later. This witness is the on-board video camera system that sees through six separate sets of eyes and records what it has seen for later use.

View Post

0 comments

Category:

mobile_photo
I just returned from the California District Attorneys Winter Conference in Long Beach, CA. PSI spent the week at the conference, exhibiting our crime and accident Documentation, Analysis and Visualization services and attending the sessions that were open to the public. This event is always one of my favorites as it affords me the opportunity to meet directly with each of the elected District Attorneys in California and discuss what issues are currently hot for them.

View Post

0 comments

Category:

mobile_photo
A nighttime collision between two tractor-trailers leaves both drivers with debilitating injuries and closes the lanes of a major California highway for hours. Upon investigation, it becomes clear that one of the drivers was entering the highway from a side road and encroached into the lane in which the second tractor-trailer was traveling. Given the straight nature of the road, the question arises: Did the oncoming tractor trailer have enough time to perceive the encroaching vehicle and avoid the collision?

View Post

0 comments

Category:

mobile_photo
Traditionally, driver’s-eye nighttime visibility cases have been visualized for the jury via film and video. The benefits of this approach are mostly related to the use of the actual vehicles and scene elements, which allows the complex lighting and visibility conditions to be replicated directly. However, this approach also has a number of drawbacks, particularly if both vehicles are in motion.

View Post

0 comments

Category:

mobile_photo
PSI has completed the fieldwork for our long awaited ballistic trajectory analysis and I have begun analyzing the statistical portion of the field test data. Calculating variances within and across the test conditions, looking for patterns and determining what degree of “error” or variance is indicated are all on the list of planned analyses. This data will be useful for seeing how best to handle similar scenarios in our real-world case work.

View Post

0 comments

Category:

mobile_photo
PSI has completed the fieldwork portion of the Ballistic Trajectory study I posted on earlier. We performed the study at the Sacramento County Gun Range in Sloughhouse, CA. The total time in the field was approximately 8 hours. Two weapon calibers were tested - heavy and slow in the form of a .45 cal handgun and light and fast in the form of an AR15 firing .223 steel jacketed rounds. Targets were two-ply drywall sections with approximately 4 inches of airspace between drywall layers and sheet metal in the form of doors from a Ford Expedition. Rounds were fired at 90 degrees (perpendicular) and 45 degrees relative to the target. The matrix of 2 calibers, 2 target types and two angles of incidence provided 8 unique test scenarios. The shooting distance was 30 yards to avoid drop in the 45 cal rounds. Each target/caliber/angle setup was fired 12 times, for a total of 96 rounds fired and analyzed.

View Post

Get this feed  

Tag List

sacramento settlement (1)
Testimony (3)
3D Animation and Video Compositing (3)
Visibility Studies (2)
Construction Worker (1)
Professional Association (1)
The Working Model (3)
3d Visualization (6)
consultant (1)
Vehicle Crush Analysis (1)
Accidental Shooting (1)
Side Bars (1)
2014 Annual Conference (1)
Laser Scanning (3)
deposition (1)
Physical Evidence (1)
Driver's Eye View Obstruction (3)
Officer Involved Shooting (3)
Nieto (1)
Ohio vs Tensing (1)
Determine Degree of Error (1)
forensic (1)
National News (1)
Crush Analysis (1)
First Degree Murder (1)
3D Gunshot Wound Path Model (6)
CNN (1)
Variances (1)
Surgical Animation (1)
Trajectory Rods (2)
Cone of Uncertainty (1)
Objections (1)
hot topic (1)
3D Laser Scanning (18)
Old Way vs Best Way (1)
Radiological (1)
Trace back to shooter's location (1)
Video Alignment (1)
Expert's Preparation (1)
Trace Back Analysis (1)
Camera Lense Field of View (1)
Sight Obstructions (1)
Criminalist (1)
nighttime visibility study (3)
911 Call Audio (1)
Wire Strike (1)
Exhibits Foundation (1)
Reconstruction (1)
largest infant death settlement in california (1)
Craig Fries (1)
World Forensic Festival (1)
Error Analysis (1)
9.75 million (1)
CDAA Winter Conference (1)
Plaintiff (2)
Seoul Korea (1)
seachao (1)
Excellent Presentations (1)
Sam Dubose (1)
Power Line Wire Strike (1)
forensic mapping (1)
Specific Calculations (1)
Guilty Verdict (1)
Explosion (1)
Eye Witness (2)
CCSF (1)
Michael Brown (1)
Ballistics Analysis (5)
Expert Witness (3)
Video Capture Frame Rate (1)
Single Vehicle Accident (1)
Incident and Exemplar Vehicles (1)
Expert's Analysis (1)
TImeline from Audio (1)
3D Animation over Nighttime Video (2)
News Van (1)
Mistrial (1)
Exemplar Life Sized Intersection (1)
forensic consultant (1)
accident reconstruction (2)
Measurements (1)
7.6 Mile Pursuit (1)
$84,000,000 Verdicts (1)
CACLD (1)
Surgical (1)
Vehicle 3D Laser Scan (1)
1000 Hours (1)
New Forensic Technology (1)
CA2RS (1)
California Association of Crime Lab Directors (1)
Personal Injury (1)
Laser Scan (4)
Eye (1)
.45 Caliber (1)
Radio Traffic (1)
Capital Crime (1)
Forensic Animation (1)
3D Working Model (18)
Witness Stand (1)
Laser Assisted Photogrammetry (2)
3D crime scene mapping (2)
Analysis (1)
ISO 17020 (1)
Fieldwork (1)
Ballistic Trajectory Analysis (7)
Medical (1)
Visible Geometry (1)
Marco Topete Murder (2)
OIS (1)
crash scene mapping (1)
Driver's Eye Video (4)
Nighttime Accident Reconstruction (2)
Determine Driver's Eye View (2)
Bus vs. Pedestrian (1)
AR15 (3)
3D Animation (10)
Ray Tensing (1)
CAC (1)
South Lake Tahoe (1)
Complex Accident Scene Reconstruction (3)
Radio Traffic Audio (1)
Video Analysis (2)
film (1)
CDAA (1)
402 Hearing (1)
forensic expert (1)
professional (1)
Forensic Science International (1)
FEWA (1)
FEWA Secretary (1)
Complete Analysis (1)
Litigation Declarations (1)
David vs. Goliath Case (1)
Assault Rifle (2)
infant death settlement (1)
Downstream Benefits of 3D Laser Scanning (1)
reconstruction analysis (2)
Litigation (1)
Autopsy Report (2)
northern california chapter (1)
Defense (2)
Shadow (1)
Photogrammetry (3)
Operator Liability (1)
Trajectory (1)
Shooter's Location (1)
Photometry (2)
7 Days on Witness Stand (1)
Muni Bus On-Board Camera System (1)
Timing and Location of Evidence (1)
Camera Lense Distortion (1)
Forensic Expert Witness Association (1)
Shadow Analysis (1)
evidence documentation (2)
California Association of Criminalists (1)
by eye (1)
scientific evidence (1)
California Association of Accident Reconstruction Specialists (1)
California District Attorneys Association (1)
Monte Carlo Method (1)
Ballistic Study (3)
Emergency Deployment Recorders (1)
Gunshot Wound Modeling (3)
Demonstrative Exhibits (1)
Illustrate Driver's Eye View (1)
Crosswalk (1)
Shooting (1)
Crosswalk in Shadow (1)
GPS Analysis (1)
animation (1)
Nieto Verdict (1)
Reporter Injured (1)
Construction Accident (1)
911 Call (1)
Peer-Reviewed (2)
Dr Judy Melinek (1)
CalTrans (1)
.223 (1)
Nighttime Video (2)
Ferguson MO (1)
3 (1)
Cross Examination (2)
body camera for deputies and officers (1)
collaborative (1)
Body Camera (1)
Animation over Video (1)
Witness Testimony (1)
San Francisco Intersection (2)
Medical Animation (1)

Tag Cloud

7.6 Mile PursuitCalifornia Association of CriminalistsGunshot Wound Modeling911 Callscientific evidencebody camera for deputies and officersSingle Vehicle AccidentCriminalist3d VisualizationCapital Crimeforensic mapping1000 HoursRadiologicalNational NewsAssault RifleFEWASouth Lake TahoeIncident and Exemplar VehiclesCACLDOfficer Involved ShootingReporter Injured2014 Annual ConferenceWitness TestimonyTiming and Location of EvidenceShadowMarco Topete Murder$84,000,000 VerdictsShadow AnalysisTrace back to shooter's locationNighttime Accident ReconstructionBody CameraCone of UncertaintyFirst Degree Murder.45 CaliberLaser ScanningPhotometryTImeline from AudioCross Examinationinfant death settlementAR15Downstream Benefits of 3D Laser ScanningCrosswalkDetermine Driver's Eye ViewShootingTestimonyVehicle 3D Laser ScanGPS AnalysisCraig FriesIllustrate Driver's Eye ViewPlaintiff402 HearingNieto VerdictExemplar Life Sized IntersectionDemonstrative ExhibitsExpert WitnessCalifornia Association of Crime Lab DirectorsBallistic Trajectory Analysissacramento settlement3D Working ModelMistrialVideo Capture Frame RateVariances3D crime scene mappingNietoOld Way vs Best WayBus vs. Pedestrianreconstruction analysisDefenseLaser Scan3D Animation and Video Compositingseachaocrash scene mappingSpecific Calculationsnorthern california chapterExpert's PreparationNews VanLitigation DeclarationsObjectionsCNNWire Strikeby eye3D AnimationSide BarsTrajectory RodsVisibility StudiesExcellent PresentationsMonte Carlo MethodProfessional AssociationRadio TrafficVideo AlignmentNighttime VideoVideo AnalysisDriver's Eye VideoAnalysisCA2RSFerguson MOFieldworkLaser Assisted PhotogrammetryTrajectoryMeasurements911 Call AudioOperator LiabilityPower Line Wire StrikecollaborativeComplex Accident Scene Reconstruction3D Laser ScanningComplete Analysis7 Days on Witness StandDavid vs. Goliath CaseDr Judy Melineklargest infant death settlement in californiaCrosswalk in ShadowRay TensingSam DuboseForensic Animation3D Animation over Nighttime VideoExplosionAnimation over VideoConstruction AccidentCrush AnalysisISO 17020CDAASeoul KoreaSan Francisco IntersectionAutopsy ReportVehicle Crush AnalysisSurgicalFEWA SecretaryForensic Science InternationalGuilty Verdictaccident reconstructiondepositionDetermine Degree of Errorhot topic3D Gunshot Wound Path ModelSight ObstructionsCDAA Winter ConferencePersonal InjuryCalifornia Association of Accident Reconstruction SpecialistsWorld Forensic FestivalMuni Bus On-Board Camera SystemanimationCamera Lense Field of ViewAccidental ShootingDriver's Eye View ObstructionPhotogrammetryforensicforensic expertOhio vs TensingForensic Expert Witness Association3The Working ModelPeer-ReviewedEyefilmSurgical AnimationTrace Back AnalysisEye WitnessprofessionalExhibits Foundationevidence documentationCalTransCalifornia District Attorneys AssociationLitigationforensic consultantBallistic StudyCamera Lense DistortionExpert's AnalysisNew Forensic TechnologyBallistics AnalysisconsultantShooter's LocationVisible GeometryMichael Brownnighttime visibility studyMedical AnimationError AnalysisCCSFRadio Traffic AudioEmergency Deployment RecordersWitness StandCACConstruction WorkerOIS.223Physical Evidence9.75 millionMedicalReconstruction