Look at the footprints below and see if you can guess what they are . Lip Prints Lip prints are often left at crime scenes on, for example, glasses and cups. Here are the five most common types of lip prints. Grab a family member or friend and look at their lip prints. Make Voiceprints Because no two human voices are alike, voiceprints have found a new role in crime prevention, security, and identification of criminals.
Voiceprints can come from many sources, including tape recordings and telephone answering machines.
These voiceprints were made using a Macintosh computer and Digital Oscilloscope software. If you would like to make your own voiceprints, you may download the software here .