In October 1904, St. Louis police became early municipal adopters of fingerprint identification in the United States. The development followed demonstrations at the city’s World’s Fair, where Inspector John Kenneth Ferrier of New Scotland Yard introduced American officials to fingerprint identification. Ferrier later taught the technique to students who helped spread it through American police and military institutions.ojp+1
Fingerprinting offered an alternative to the Bertillon system, which organized identification records around detailed body measurements, photographs, and physical descriptions. Developed by French police official Alphonse Bertillon, the method recorded features such as head dimensions, forearm length, and finger length. But different people could have very similar measurements. Fingerprints offered a way to distinguish individuals whom the older records could struggle to separate, although the two systems continued to operate alongside one another for years.ojp
The famous case of Will West and William West illustrates that limitation—but its familiar telling needs caution. In 1903, Will West entered Leavenworth Penitentiary, where another inmate, William West, bore a striking resemblance to him and had very similar body measurements. Their fingerprints distinguished them. Later accounts turned the episode into a dramatic turning point in identification history, but their exact relationship remains uncertain, and historians dispute its role as the immediate catalyst for fingerprinting’s adoption. The better-documented connection runs through the World’s Fair: on October 19, 1904, Ferrier and Major M. W. McClaughry began fingerprinting Leavenworth’s inmates, creating the foundation of the federal government’s fingerprint collection.
