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.
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