The recommended height for the fingerprinting device (Card or Live-Scan) is approximately thirty-nine inches from the floor. This will allow the forearm of an average adult being fingerprinted to be parallel to the floor, at which position it is best to roll and record fingerprints.
If the fingerprinting device is not at this height, care must be taken or the finger tends to rise off the device. If this happens, the technician will fail to capture the lower portion of the first joint and necessary ridge detail will be missing.
