Representation of the historical practice of fingerprint identification and the meaning of the term NIFM. When expert assessment of the detail within a mark exceeds a sufficiency threshold, the mark is graded as an identifiable fingerprint (upper, green shaded, rectangular region). The trapezoidal, light green shaded region just below represents marks where there is variation in the expert assessment. The lower rectangular, gray shaded region represents marks where all experts would agree that there is insufficient detail for identification (NIFMs).