Postmortem by Patricia Cornwell Read Free Book Online Page B
Authors: Patricia Cornwell
with a dried bloody shoe print, both inside plastic bags and tagged as evidence. Randomly scattered about were ten small jars of formalin, each containing a charred human fingertip anatomically severed at the second joint. In cases of unidentified bodies that are badly burned or decomposed, it isn't always possible to get prints by the usual method. Incongruously stationed in the midst of this macabre mess was a bottle of Vaseline Intensive Care lotion.
Rubbing a dollop of the lotion on his hands, Vander pulled on a pair of white cotton gloves. The acetone, xylene and constant hand-washing that go with his trade were brutal on his skin, and I could always tell when he'd forgotten to put on gloves while using ninhydrin, a chemical helpful for visualizing latent prints, because he'd walk around with purple fingers for a week. His morning ritual complete, he motioned me to follow him out into the fourth-floor hallway.
Several doors down was the computer room, clean, almost sterile, and filled with light-silver modular hardware of various boxy shapes and sizes, bringing to mind a space-age Laundromat. The sleek, upright unit most closely resembling a set of washers and dryers was the fingerprint matching processor, its function to match unknown prints against the multimillion fingerprint data base stored on magnetic disks. The FMP, as it was known, with its advanced pipeline and parallel processing was capable of eight hundred matches per second. Vander didn't like to sit around and wait for the results. It was his habit to let the thing cook overnight so he had something to look forward to when he came to work the next morning.
The most time-consuming part of the process was what Vander did Saturday, feeding the prints into the computer. This required his taking photographs of the latent prints in question, enlarging them five times, placing a sheet of tracing paper over each photograph and with a felt-tip pen tracing the most significant characteristics. Next he reduced the drawing to a one-to-one-sized photograph, precisely correlating to the actual size of the print. He glued the photograph to a latent-print layout sheet, which he fed into the computer. Now it simply was a matter of printing out the results of the search.
Vander seated himself with the deliberation of a concert pianist about to perform. I almost expected him to flip up his lab coat in back and stretch his fingers. His Steinway was the remote input station, consisting of a keyboard, a monitor, an image scanner and a fingerprint image processor, among other things. The image scanner was capable of reading both ten-print cards and latent prints. The fingerprint image processor (or FIP, as Vander referred to it) automatically detected fingerprint characteristics.
I watched him type in several commands. Then he punched the print button, and lists of potential suspects were rapidly hammered across the green-striped paper.
I pulled up a chair as Vander tore off the printout and ripped the paper into ten sections, separating his cases.
We were interested in 88-01651, the identification number for the latents found on Lori Petersen's body. Computerized print comparison is analogous to a political election. Possible matches are called candidates, and ranked according to score. The higher the score, the more points of comparison a candidate has in common with the unknown latents entered into the computer. In the case of 88-01651 there was one candidate leading by a wide margin of more than one thousand points. This could mean only one thing.
A hit.
Or as Vander glibly put it, "A hot one."
The winning candidate was impersonally listed as NIC112.
I really hadn't expected this.
"So whoever left the prints on her has prints on file with the data base?" I asked.
"That's right."
"Meaning it's possible he has a criminal record?"
"Possible, but not necessarily."
Vander got up and moved to the verification terminal. He lightly rested his fingers on the keyboard
Rubbing a dollop of the lotion on his hands, Vander pulled on a pair of white cotton gloves. The acetone, xylene and constant hand-washing that go with his trade were brutal on his skin, and I could always tell when he'd forgotten to put on gloves while using ninhydrin, a chemical helpful for visualizing latent prints, because he'd walk around with purple fingers for a week. His morning ritual complete, he motioned me to follow him out into the fourth-floor hallway.
Several doors down was the computer room, clean, almost sterile, and filled with light-silver modular hardware of various boxy shapes and sizes, bringing to mind a space-age Laundromat. The sleek, upright unit most closely resembling a set of washers and dryers was the fingerprint matching processor, its function to match unknown prints against the multimillion fingerprint data base stored on magnetic disks. The FMP, as it was known, with its advanced pipeline and parallel processing was capable of eight hundred matches per second. Vander didn't like to sit around and wait for the results. It was his habit to let the thing cook overnight so he had something to look forward to when he came to work the next morning.
The most time-consuming part of the process was what Vander did Saturday, feeding the prints into the computer. This required his taking photographs of the latent prints in question, enlarging them five times, placing a sheet of tracing paper over each photograph and with a felt-tip pen tracing the most significant characteristics. Next he reduced the drawing to a one-to-one-sized photograph, precisely correlating to the actual size of the print. He glued the photograph to a latent-print layout sheet, which he fed into the computer. Now it simply was a matter of printing out the results of the search.
Vander seated himself with the deliberation of a concert pianist about to perform. I almost expected him to flip up his lab coat in back and stretch his fingers. His Steinway was the remote input station, consisting of a keyboard, a monitor, an image scanner and a fingerprint image processor, among other things. The image scanner was capable of reading both ten-print cards and latent prints. The fingerprint image processor (or FIP, as Vander referred to it) automatically detected fingerprint characteristics.
I watched him type in several commands. Then he punched the print button, and lists of potential suspects were rapidly hammered across the green-striped paper.
I pulled up a chair as Vander tore off the printout and ripped the paper into ten sections, separating his cases.
We were interested in 88-01651, the identification number for the latents found on Lori Petersen's body. Computerized print comparison is analogous to a political election. Possible matches are called candidates, and ranked according to score. The higher the score, the more points of comparison a candidate has in common with the unknown latents entered into the computer. In the case of 88-01651 there was one candidate leading by a wide margin of more than one thousand points. This could mean only one thing.
A hit.
Or as Vander glibly put it, "A hot one."
The winning candidate was impersonally listed as NIC112.
I really hadn't expected this.
"So whoever left the prints on her has prints on file with the data base?" I asked.
"That's right."
"Meaning it's possible he has a criminal record?"
"Possible, but not necessarily."
Vander got up and moved to the verification terminal. He lightly rested his fingers on the keyboard
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