Usually people will be very mindful to be collateralized at all time. The reason is that, we have absolutely no guarantee to life. Consequently, they have to end up being very protecting in all means. The public security will be given with the government. They are going to appoint the security people to guard them in public places. In order to avoid much time, they prefer to make use of some useful machines including metal detector. There are many sorts of metal doctors are widely-used in the market. Between that, they could make use of walk through metal detector which may be used to identify the metal bodies in easy manner.