|Posted on Tuesday, February 03, 2004 - 04:05 pm: ||
It serves a third purpose as well. Because friction ridge skin is pliable, the flat impression gives us a "less distorted" view of the pattern type and friction ridges. The flats were very useful when (many years ago) we assinged pattern types to enter prints into AFIS as well as performing Henry classification.
|Posted on Saturday, January 31, 2004 - 07:48 pm: ||
"Plain impressions" are the four fingers together, pressed onto the ink slate together, and pressed onto the card together. This records their relationship to one another and makes it possible to determine whether it is the right or left hand because of finger position and pattern type. The thumbs are taken separately, but they also appear on the bottom of the fingerprint card.
"Plain impressions" serve two purposes:
1) to provide a double-check that the rolled fingerprints above were placed in the correct fingerprint block
2) to provide a second impression of every finger. This way even if one impression is distorted, there is a chance it will be clear in the other.
|Posted on Saturday, January 31, 2004 - 01:31 pm: ||
What is a plain impression and why must it be taken on a finger print card?