About 50 students and four faculty members at the South Dakota School of Mines and Technology use pay pads such as this one, shown in a Feb. 15, 2013, photograph, in place of cash or credit cards to pay for items. The pilot program using Biocryptology -- or one's fingerprint and hemoglobin -- to identify buyers. (AP Photo, Amber Hunt)

Associated Press
About 50 students and four faculty members at the South Dakota School of Mines and Technology use pay pads such as this one, shown in a Feb. 15, 2013, photograph, in place of cash or credit cards to pay for items. The pilot program using Biocryptology -- or one's fingerprint and hemoglobin -- to identify buyers. (AP Photo, Amber Hunt)
About 50 students and four faculty members at the South Dakota School of Mines and Technology use pay pads such as this one, shown in a Feb. 15, 2013, photograph, in place of cash or credit cards to pay for items. The pilot program using Biocryptology -- or one's fingerprint and hemoglobin -- to identify buyers. (AP Photo, Amber Hunt)
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