The Midwest Automated Fingerprint Identification Network (MAFIN) is a regional criminal history database consisting of arrest records from Minnesota, North Dakota, and South Dakota. The arrest records consist of Ten Print fingerprint cards, and may also include palm print cards. MAFIN is maintained by the Minnesota Justice Information Systems (MNJIS) department of the BCA.
Unidentified latent prints recovered from crime scenes can be searched in the MAFIN database. Unique features present in the latent print are plotted by their position and angle, and ridges are traced. The resulting configuration of features is searched by the computer against the known arrest records in the database, comparing it to the configurations previously extracted in the arrest records, and produces a list of top possible matching candidates. The list is then reviewed by a latent print examiner to determine if a matching candidate is indeed present.