Here is a picture of our pollen collectors under the microscope and then a drawing by yours truly. 

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Forensics Palynology 

Forensic Palynology is a specialized field that studies the spores and pollen as evidence. 

The four parts of pollen fingerprints:

1) number of pollen grains

2) type of pollen grains 

3) found in a certain area 

4) at a particular time of year 

Our flower is a female because our flower has the ovary and the anther  

   

Comparing Cartriges found at the crime scene

In this report we were to study Dan’s bullets to those at a crime scene. We made a diagram to compare the cartridge of Dan’s and the ones that we found at the scene. The results of this comparison were that Dan was innocent by looking at the compared cartridges.

Ballistics is the science that studies movement of objects (bullets etc. ) Guns can be classified as long guns ( two hands), handguns (one hand), firearms, and rifles.  To analyze the ballistic evidence you can look at the markings on the cartridge, a cartridge is a case or shell that holds a bullet, primer powder, and gun powder. This will show the movement of the bullet, different guns will create different markings on the bullets/cartridge.

bullets

As you can see on the picture of the bullets above, they both have grooves, these grooves are from the exiting of the bullet. Each gun will create a different pattern on the bullets. Also, firing pin marks appear on the rim or center of the spent cartridge. Breechblock marks are produced when the cartridge casing slams into the bullet/ammunition.

cartridge.png

 

At our crime scene the ammunition that was found were casings and two bullets that were used. The bullets were used for live ammunition. The same for the casings that were found even though it is not live ammunition now, it was at one time. The caliber of each piece of ammunition was measured in MM. The 12GA is 2.2 mm, 20GA is 2.1mm, 44REM MAG is 1.8mm, 40 S&W is 1.5mm, Super (believe 22 shotgun) is .5mm, and lastly the bullets measured were 1.2mm. Most of the ammunition found came from a shotgun, what we did find is that the bullet that Dan had shot came from a long gun or rifle.

 

I do believe I have some kind of evidence that my gun was used in the crime scene, Dan was shooting the same bullets of that at the crime scene. Dan’s bullet is the on at the bottom and the other two were the ones found at the crime scene. Dan’s bullets seemed as those of a shotgun  a 44 gauge shot gun.

bullets 2

In our head their are two wounds total, one being an exit wound and the other an entrance wound. The reason we can tell which is the entrance wound is if the wound is small and round, usually a pretty clean entrance. We can determine an exit wound of how large the wound is, the reason an exit wound is typically larger is because the bullet will carry parts of the body with it. The more the bullet brings with it the bigger the exit wound.  Down below the fist picture is the entrance wound and the second picture is the exit wound which is about  3mm wide.

Based on the wounds, the gun that was used was a handgun. The reason behind this is a handgun will usually leave a clean wound mark. Also, smaller calibers tend to lodge in the body while larger calibers with pass through. This bullet that was shot was a big enough bullet to pass through the body. While a rifle or shotgun (not a 22 shotgun) the bullets are much larger and the gunpowder inside would leave speckle marks all over the target.

The GSR tells us about how far or how close the shot was from. Since we cannot see any GSR I am assuming that the person who shot this gun was 36 or more inches away from the target.

The approximate angle that the bullet made through the head was at an angle because the shot was made just above the left eye on the temple and came out the back of the head. Meaning that the person who shot this bullet was mostly straight in front of the target but slightly off. This may imply on the situation that the person making this shot was doing this intentionally, trying to kill the victim in one shot.

 

I do not believe that officer Dan was involve in the crime scene because as you can see in the diagram below comparing the two cartridges, the half cartridge on the left side is officer Dan’s and the half cartridge on the right is the cartridge found at the crime scene, after going over everything that I’ve learned, the firing pin marks do not hit the same and there are breechblock marks on officer Dan’s cartridge and nothing on the crime scene cartridge.

diagram bullets.png

What I have learned while studying ballistics and doing this experiment is that studying ballistics is very difficult and tedious work. I learned how to compare cartridges and how to measure the gauge of a gun and how each gun will leave a different pattern on bullets.The next steps in this investigation should be to further examine all of the bullets found.

 

 

Fingerprint Lab Report

 

You might say that DNA is the only way to find out who the suspect is, but did you know that you have a unique print on each of your fingers? Every fingerprint is unique in its own way and no two fingerprints are alike. A person’s fingerprints are formed when they are a tiny developing baby in their mother’s whom. Pressure on the fingers from the baby touching, and their surroundings create what are called “friction ridges”, the faint lines you see on your fingers and toes.

The role fingerprints play in forensic science is to match the fingerprints to that of with a potential suspect or to match fingerprints to those at a crime scene. When fingerprinting their are three ways you can pickup/see the prints. The three ways to pick up fingerprints, the first way is a latent print. The way to pick up a latent print is to dust the print with black or florescent powder, then lift the print with tape (What we did in class). Another way to collect fingerprints is a plastic impression, this would be a fingerprint in clay or playdoh etc. Lastly, there is the patent print that is visible to the naked eye. These prints can be seen at the crime scene through blood, paint, etc.

When looking at fingerprints you also need to notice and match up the minutiae. The minutiae falls into three categories, Loop, Whorl, and Arch. If you are looking at a fingerprint that is has the whorl shape then you do not have to look at Arch or Loop and visa versa.

fingerprint patterns

When testing out this lab the materials we used were camel, or fiberglass  brushes, a glass jar with finger prints on them, black or florescent powder, tape to lift the print, and index cards. The techniques used while lifting the prints were to put black or florescent powder just on the fingerprint to insure a good lift. Next our group would cut a small piece of tape and place the tape on the glass jar right on the print. Pressing down the tape on the fingerprint then slowly lifting the print and placing it on an index or black card depending on the powder we used.

When looking and comparing fingerprints you should always compare minutiae to see if the two prints you are comparing actually match, minutiae are different patterns in the fingerprints.

minutiae2

In the diagram below I am comparing two fingerprints the circles are connecting the similar minutiae.

  1. Red- Tented arch
  2. Light Blue- Whorl
  3. Green- Arch
  4. Purple- Fork (Bifurcation)
  5. Island – Island or short ridge
  6. Orange- Eye (Enclosure or island)
  7. Black- Spur or hook
diagram.png
With these two prints compared to each other, I am comparing the prints of Monika. I have chosen to compare these two because they have some similarities, the other suspect I am looking at would be those of Jessica. I have eliminated the other suspects because the prints are not even close to matching. I do not think these fingerprints match, they do have some of the same minutiae patterns but are not exactly  alike. I also believe if the florescent fingerprint lifting would have came out more clear we could compare the two prints better.
 During this project I have learned that it is very hard to identify fingerprints with the naked eye but most importantly I have learned how to dust and lift fingerprints. I have also learned the different types of minutiae to compare the prints. Lastly, I have learned that this process is not like CIS. This process takes months with all the fingerprints that need to be examined.