Applying this lesson to the fingerprint differentiation system, this is still the era of specialists, when only police and intelligence experts are using them. Further, there are still problems with the technology, such as children not knowing where to put their fingers, or the optical lens not being able to get a clear picture for the computer if a person's hands are too dry.
反觀指紋辨識系統，現在還是警務、情報系統專家在處理的時代；而指紋辨識的技術也還有尚未突破之處，例如小孩在按指紋時，可能就不知道怎麼把手指擺在最恰當的位置；手指太乾燥時，光學鏡頭也無法很完美地將指紋讀進。