Today, May 8, 2007 Sir Florentino taught us how to swab a gun and he told us the purpose of Cotton Swabbing. The purpose of cotton swab is to determine presence of gun powder in an evidence firearm. I, Isabelle and Mark Carlo tried one by one. We cotton swab one gun by putting a cotton on a barrel then use a stick to push the cotton to pass the barrel and get gun powders. We did cotton swabbing on the barrel twice and we also cotton swab the holes of where bullets are place. The agency will conduct further examination on the cottons used in the cotton swabbing.
Posted by: faye
Thursday, May 17, 2007
Monday, May 14, 2007
My Debut Blog
A week ago, May 7, 2007, I started my internship in the crime laboratory. It was easy and I was well oriented about the things to do. First, i was taught on how to perform the macro-etching exam. It is were you check the chassis and the engine number. Whether it is tampered or not which is basically common among stolen vehicles. The tricky and the dirty part is when you look for the chassis and the engine number. If it's dusty, you'll be sneezing your way all day long. Literally.
Shortly after, Ma'am de Guzman, head of the crime laboratory, taught me the Marquiz and the Simon's test. These tests are used to know whether Marijuana and Methampetamine Hydrochloride, commonly known as "shabu", is present in urine.
Later on that day, Ma'am de Guzman performed the paraffin-DPA text or the dermal-nitrate test.By the way, DPA stands for diphenylamine. The test seems quite easy. All you have to do is to spread DPA all over the paraffin wax they have taken some days before(now, that's more or less a week ago). After which, you'll have to check for blue specks or nitrates. Gun powder nitrates to be exact. However, this procedure is corroborative because of some reasons like : humidity, wind velocity, gloves and the type of ammunition.
Shortly after, Ma'am de Guzman, head of the crime laboratory, taught me the Marquiz and the Simon's test. These tests are used to know whether Marijuana and Methampetamine Hydrochloride, commonly known as "shabu", is present in urine.
Later on that day, Ma'am de Guzman performed the paraffin-DPA text or the dermal-nitrate test.By the way, DPA stands for diphenylamine. The test seems quite easy. All you have to do is to spread DPA all over the paraffin wax they have taken some days before(now, that's more or less a week ago). After which, you'll have to check for blue specks or nitrates. Gun powder nitrates to be exact. However, this procedure is corroborative because of some reasons like : humidity, wind velocity, gloves and the type of ammunition.
Friday, May 11, 2007
Testing Marijuana
Thursday in the afternoon, Ma'am Vicky let I, Isabelle and Mark observed her test Marijuana. First, she made us smell a standard Marijuana and a suspected MArijuana. The smell was different so we guess that suspected marijuana is not a real marijuana. Yet, we chemically test the suspected marijuana. We applied fastblueb salt test to both specimens (the suspected marijuana and the standard example of marijauana. The result was different so we can already say that the suspected marijuana is indeed not a real marijuana.
Ma'am Vicky let us read effects and dangers of marijuana last tuesday. A marijuana could also be called mary jane, brownies and so on. It can made us confused, it can distort our emotions and senses, can give us chest pain, can make us easily forget. Marijuana is not good for our body. It has many side effects and it cannot solve our problems. Now, it is up to you if you will still use marijuana or not.
Posted by: Faye
Ma'am Vicky let us read effects and dangers of marijuana last tuesday. A marijuana could also be called mary jane, brownies and so on. It can made us confused, it can distort our emotions and senses, can give us chest pain, can make us easily forget. Marijuana is not good for our body. It has many side effects and it cannot solve our problems. Now, it is up to you if you will still use marijuana or not.
Posted by: Faye
All About Lectures
Sir Chan gave us a lecture about SOCO (SCENE OF THE CRIME OPERATION). He lectured us about what are the things they do in a crime scene, how to preserve the evidences and who are the members of the team.
Ma'am Vicky also gave us a lecture on Forensic Chemistry and on dangerous drugs. She lectured us about the effects of these dangerous drugs and she gave us some reading materials that we can study.
We had a lecture about fingerprints again with Sir Andres. He showed us some other kinds of fingerprints. He let us perform how to get the fingerprints or each other but since I've already done this before with Faye, Mark was the only one who did it. He also taught us on how to transfer the fingerprint found in a crime scene. He put a black powder on it and scattered it using a brush. Then he put a scotch tape on it and transferred it on a bond paper.
posted by Isabelle
The Test
Yesterday, the crime lab received a white crystalline substance to be tested for the presence of Methamphetamine Hydrochloride and crushed leaves that is suspected to be marijuana. Our supervisor tested the white crystalline substance first. Like what I have written before about how to test the presence of shabu, she did that same test again. She also compared the white crystalline substance's reaction to tawas, rock salt, iodized salt and white sugar's reaction to the three reagent and only the unknown white crystalline substance gave a positive result.
Next, our supervisor tested the crushed leaves that is suspected to be Marijuana. She also used a standard or real dried marijuana plant to compare it to the suspected crushed leaves. She compared their smells and they were different. She used the fastblueb salt test. And after she did the test, the result was negative because it was dark red in color and the expected color if its positive is bright red.
posted by Isabelle
Next, our supervisor tested the crushed leaves that is suspected to be Marijuana. She also used a standard or real dried marijuana plant to compare it to the suspected crushed leaves. She compared their smells and they were different. She used the fastblueb salt test. And after she did the test, the result was negative because it was dark red in color and the expected color if its positive is bright red.
posted by Isabelle
The Test
Yesterday, the crime lab received a white crystalline substance to be tested for the presence of Methamphetamine Hydrochloride and crushed leaves that is suspected to be marijuana. Our supervisor tested the white crystalline substance first. Like what I have written before about how to test the presence of shabu, she did that same test again. She also compared the white crystalline substance's reaction to tawas, rock salt, iodized salt and white sugar's reaction to the three reagent and only the unknown white crystalline substance gave a positive result.
Next, our supervisor tested the crushed leaves that is suspected to be Marijuana. She also used a standard or real dried marijuana plant to compare it to the suspected crushed leaves. She compared their smells and they were different. She used the fastblueb salt test. And after she did the test, the result was negative because it was dark red in color and the expected color if its positive is bright red.
Next, our supervisor tested the crushed leaves that is suspected to be Marijuana. She also used a standard or real dried marijuana plant to compare it to the suspected crushed leaves. She compared their smells and they were different. She used the fastblueb salt test. And after she did the test, the result was negative because it was dark red in color and the expected color if its positive is bright red.
Tuesday, May 8, 2007
The Second Part
Last Friday, Sir Chan did the Paraffin Casting and yesterday Mam Vicky performed the paraffin test. Together with Faye and Mark who had just reported, we observed how Mam Vicky did the test. She put Diphenylamine or commonly known as Lange's Reagent to the cast. If it is positive of gun powder nitrates, a blue color will appear from the bottom and will continue to grow bigger. Sometimes there are blue dots that would appear, but if it didn't come out from the bottom, so it is not gun powder nitrates. It could be a contamination because nitrate can also be present in other like the soil.
The paraffin test can be performed only within 72 hours from the time that person fired the gun because after 72 hours the nitrates might already be blown away by the wind or other factors. They don't also perform paraffin test to a person who was already embalmed because the pores of the skin will no longer open so it you put a hot wax for the nitrate to evaporate it will just stick to the wax.
posted by:
Isabelle Melinette M. Gucor
The paraffin test can be performed only within 72 hours from the time that person fired the gun because after 72 hours the nitrates might already be blown away by the wind or other factors. They don't also perform paraffin test to a person who was already embalmed because the pores of the skin will no longer open so it you put a hot wax for the nitrate to evaporate it will just stick to the wax.
posted by:
Isabelle Melinette M. Gucor
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