The ridge (隆起) structure on a person's fingers does not change with growth and is not affected by surface injuries. Burns, cuts and other damage to the outer part of the skin will be replaced in time by new skin, which bears a reproduction of the original pattern. __21__ Some criminals make use of this fact to remove their own fingerprints but this is a dangerous and rare step to take.

　　Fingerprints can be made very easily with printer's ink. They can be recorded easily. __22__ Because of the simplicity and economy of this system, fingerprints have often been used as a method of solving criminal cases. A suspected man may deny a charge but this may be in vain. __23__ When a suspect leaves fingerprints behind at the scene of crime, they are difficult to detect with the naked eye. __24__ Some of the marks found are incomplete but identification is possible if a print in the size of a quarter of an inch square can be obtained.

　　A．Special techniques are used to “develop” them.

　　B．A fingerprint is an impression of the friction ridges of all part of the finger.

　　C．It is only when the inner skin is injured that the arrangement will be destroyed.

　　D．With special methods, identification can be achieved successfully within a short time.

　　E．A latent print is the chance reproduction of the friction ridges deposited on the surface of an item.

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