Conversation so far:
when were fingerprints first used in crime detection
At Buenos Aires, Argentina in 1892, Inspector Eduardo Alvarez made the first criminal fingerprint identification
from whom did inspector eduardo alvarez learn the fingerprint identification method
Inspector Eduardo Alvarez had learned to compare fingerprints from Juan Vucetich
who was juan vucetich
Juan Vucetich was a fingerprint researcher, statistician and the head of the bureau of Anthropometric Identification at the Central Police Department in La Plata, Argentina

Question: when did the researcher create the identification method
Self-contained rewrite: when did juan vucetich create the fingerprint identification method