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CRJ499: Undergraduate Capstone in Criminal Justice

Week 5 SAMPLE Information for PowerPoint … MOCK CRIME SCENE INVESTIGATION

Mock Crime Scene

Investigate a crime scene from your desktop!  Begin your investigation by reading the summary of the facts and continue by visiting Forensic Services and having evidence processed.  Keep investigating to determine the identity of your suspect.  Navigation buttons at the bottom of each page will allow you to move forward, backward, or start over -- OR -- use the navigation links on the right side to jump to the page of your choice.

The following pages represent the scene of a violent, but fictitious crime.  The individuals depicted are actors.  No criminal involvement should be inferred by their participation.

Mock Crime Scene - Crime Scene Unit

The Crime Scene Unit photographed the scene, collected evidence, and processed for latent prints. Overall, midrange, and close up photographs were taken of the items of evidence marked with placards. Each item with a numbered placard was collected as evidence and each lettered item was swabbed for DNA. All items were packaged and submitted to evidence for impound. The scene was then processed for latent fingerprints using Black and Magna Powders.  Latent fingerprints were detected, lifted and submitted to the Latent Print Unit for further analysis and comparison to suspects #1 and #2.

View the Scene

View the scene

Updated on 02/24/2015 4:04 PM

Numbers are used for items collected from the scene. Letters are used when a only a sample is collected.

MCS1

MCS1

MCS2 MCS3 MCS4 MCS5

MCS2 MCS3 MCS4 MCS5

Photo Lab Unit

The photo lab managed and made copies of the photographs taken at this scene. Digital photos were downloaded, logged in, verified, and added to the department's imaging system. Using this system, detectives were able to view photographs of the scene from their desk and order the reprints, enlargements, and photo CDs they needed during the investigation and trial.

Firearms Unit

 

The Firearms Unit analyzed two cartridge cases, one bullet (projectile), and one firearm recovered from the crime scene. They also analyzed another firearm recovered from suspect #2. The Firearms Unit compared the bullet and cartridge cases from the crime scene to test fires from the firearm collected at the scene (item marked #6). It was excluded as having fired the bullet/cartridge cases. A serial number restoration was also completed on this firearm.  Running the serial number through NCIC revealed that the weapon was stolen six months earlier. The Firearms Unit compared the bullet and the cartridge cases from the crime scene to test fires from the firearm found on suspect #2. It was determined that the bullet and both cartridge cases were fired from this firearm. The Firearms Unit also identified the shoeprint left at the scene to a shoe found on suspect #2.

Evidence Processing Unit

Using Cyanoacrlate ("super glue") fuming, MBD dye, and black powder on the knife collected at the crime scene and Cyanoacrylate fuming, ARDROX dye stain, and black powder on both firearms, the Evidence Processing Unit developed latent prints on all three items.

Afterwards, the Evidence Processing Unit swabbed the knife and firearms and took cuttings of the cigarette butts to allow the Biology unit to perform DNA testing.

Latent Print Unit

The Latent Print Unit compared the latent fingerprints developed by the Evidence Processing Unit on the firearm found on suspect #2 to the major case exemplars obtained from both suspects.  A latent print found on the gun was identified to suspect #2.  A latent print developed on the knife was entered into the Arizona Automated Fingerprint Identification System (AZAFIS) and was identified to the victim, John Doe.

 

Controlled Substances Unit

The Controlled Substances unit analyzed the off-white substance found at the scene. The substance was found to weigh 471.7 grams and the following preliminary color tests were performed, Marquis test, Cobalt Thiocyanate test and Sodium Nitroprusside test. The results of the preliminary color tests indicated the presence of methamphetamine. The substance was then instrumentally analyzed using  Gas Chromatography Mass Spectrometry  (GC/MS), which confirmed the presence of methamphetamine.

Toxicology Unit

Blood and urine sample were collected from the two suspects.  The Toxicology Unit analyzed the blood for alcohol using  Headspace-Gas Chromatography  (GC) with  Flame Ionization Detection  (FID), which resulted in a 0.12% blood alcohol concentration on suspect #1 and a 0.18% blood alcohol concentration on suspect #2.

The Urine was screened for drugs using  Enzyme-Linked Immunosorbent Assay (ELISA.)  Methamphetamine and amphetamine (methamphetamine metabolite) were confirmed by  Gas Chromatography/Mass Spectrometry  (GC/MS) in suspect #1.  Suspect #2 had negative results.

Biology Unit

The Serology section performed phenolphthalein testing on the bloody items and tested the drinking items for the presence of amylase (a constituent of human saliva.)

The DNA section performed a  Polymerase Chain Reaction  (PCR) technique to obtain DNA profiles for the above items. The profile from the knife handle matched a known DNA sample from the victim, John Doe, and the blood on the knife matched the known DNA sample from suspect #2. The blood from the shoeprint and the shoe at the scene matched the victim's profile

Conclusion

Reviewed my photos
Viewed photos
Tested evidence