CSI Investigations

At a recent meeting of MWA Florida, we heard a CSI investigator from North Miami PD speak about her experiences. “Our day begins when yours ends,” she quipped. A beautiful woman who is married with five children, she could be a TV star of her own show. She proceeded to differentiate what’s real and what isn’t from what we see on television. The “CSI Effect” is what people expect from watching these shows, like immediate test results. That isn’t what happens in reality when it might take years. However, these dramas are good for bringing attention to an underfunded field. Private labs might produce quicker results, but she’s not allowed to use them for legal reasons. 

Why doesn’t she drive a Hummer? This is one of the questions she’s been asked. She drives a van because it’s large enough to hold her equipment and has storage space. She never parks in front of a business unless she’s on a case because that would drive customers away.

DNA testing can take months. Florida is number one for the best hits on CODIS (Combined DNA Index System). You must have been arrested to be on this database. In Miami, they have one year from date of entry to make a hit with a suspect. Otherwise, the statute of limitations runs out. Two types of DNA concern them: Mitochondrial and Nuclear. The latter contains a cell’s nucleus and goes back to a single source while the genetic pool is larger for the former type of DNA.

IAFIS (Integrated Automated Fingerprint Identification System) is fingerprint storage and retrieval. Usually it’s the latent examiner who makes the hit, although this can be subjective. Prints come from people who’ve been arrested. Other sources for prints can be places like jobs that require them, immigration, etc.

Five manners of death exist:

Homicide
Suicide
Accident
Natural (over 80%)
Undetermined

She says investigators specialize in certain areas, and the science and technology are constantly changing. They look for signs of foul play. For example, if you are sick or injured, you may curl on your bed into fetal position. You don’t lie prone in a closet, where a body was found. It was later determined he died from a broken neck. A migrant worker renovating the house was guilty of murder.

With Live Scan, ink isn’t used for fingerprinting. The old method often resulted in operator error—too much or too little ink, not rolling the prints properly. There are 150 points of identification on each finger. Patterns can be a loop, arch, or whorl or a combination therein. Footprints have similar characteristics. Fingerprints develop at 7 months in the womb. Changes may occur with scarring, like musicians who grow calluses. How long do prints remain on the scene? Forever, unless they are removed.

They give every case a name, like the Lemon Case where a guy supposedly fell on his knife when paring fruit. She’ll look in the kitchen, in the garbage for clues. It turned out the man’s girlfriend stabbed him, and friends helped her cover it up. But they neglected to erase the footwear impression where someone had stepped on the knife.

As a mystery writer, it’s important to get the facts straight. We can’t rely on what we watch on TV.

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Disclaimer: These are my notes and they are subject to my interpretation. Any errors are not intentional.