Mr. LATONA. That is simply by sheer experience. Mr. EISENBERG. Would you say, therefore, that the identification of a fingerprint is a task which calls for an expert interpretation, as opposed to a simple point-by-point laying-out which a layman could do? Mr. LATONA. Very definitely so; yes. Mr. EISENBERG. How much training does it take before you can make an identification? Mr. LATONA. Well, I cannot tell you exactly how much in terms of time, insofar as what constitutes an expert. I can simply tell you what we require of our people before they would be considered experts. Mr. EISENBERG. Yes, could you do that? Mr. LATONA. We require our people before they would be---- Mr. DULLES. This is the FBI? Mr. LATONA. Yes; this is the FBI. It would be 10 years of practical work in connection with the classifying and searching and verifying of regular fingerprint cards which bear all 10 prints. Those prints would be searched through our main fingerprint files. That means that that person would have to serve at least 10 years doing that. Of course, he would have to progress from the mere searching operation to the operation of being what we call unit supervisor, which would check--which would be actually the checking of the work of subordinates who do that work. He would be responsible for seeing that the fingerprints are properly searched, properly classified. Mr. EISENBERG. And how long will he work in the latent fingerprint section? Mr. LATONA. He would have to take an adaptability test, which would take 3 or 4 days, to determine, first of all, do we feel he has the qualifications for the job. Then if he passed the adaptability test, he would receive a minimum of 1 year's personal training in the latent fingerprint section--which means that he would have to serve at least 11 years in fingerprint work constantly, day in and day out, 8 hours a day in fingerprint work, before we would consider him as a fingerprint expert for purposes of testifying in a court of law. Mr. EISENBERG. So that when you show us this chart, this is actually, or I should say, is this actually a demonstration, rather than a chart from which we could make an identification? Mr. LATONA. That's right. The purpose is simply a hope on my part that by my explanation you may have some idea as to how a comparison is made, rather than for me to prove it to you through these charts, because unquestionably there are certain points that you will not see which to me are apparent. Mr. EISENBERG. Now, Mr. Latona---- Mr. DULLES. May I ask a question? Is this ridge formation, sort of two ridges coming together, is that one of the most distinctive things you look for? I note on these charts, Exhibit 634, the various examples you have given us have been of one type so far. Mr. LATONA. Two.