It is said that the special feature is shown in the expression which the people who is trying homicide,assassination and terrorism shows according to the book”Appearing in the face” (Kenji Shimizu, Chuko shinsho La Clef) .

It appears in expression as the fine expression only for a moment. A guard of pros such as SP reads those fine expression and watches out for a suspicious person.

As for fine expression, the case where it appears in the perimeter of nose and the month is often.

If mask wear is natural , facial expression will not be known but it will become difficult to deter homicide,assassination and terrorism in advance. Mask wear is likely to have a problem from a viewpoint on the public peace and order.

Kei