The letters also provide another important piece of information—fingerprints. We run these through databases maintained by the FBI, CIA, NSA, Interpol, MI6, and the Mossad. If we find a match, it goes straight on the Naughty List. We also harvest a saliva sample from the flap of the envelope in which the letter arrives in order to establish a baseline genetic identity for each correspondent. This is used to determine if there might be an inherent predisposition for naughtiness. A detailed handwriting analysis is performed as part of a comprehensive personality workup, and tells us which children are advancing nicely with their cursive and which are still stubbornly forming block letters with crayons long past the age when this is appropriate.