What would you do if a hurried visitor resists metal screening while entering the premises?

he has to go through the metal screening other wise you follow the regulations.

If your facility has metal detectors then you should also have armed security monitoring those entry points. There is no question, anyone attempting to bypass site security measures should be considered an immediate threat and dealt with accordingly.

Refuse them entry , they may be in possession arms or dangerous goods 

Security System applied for everyone .in case that any  visitor is attempting to  violate site /facility rules by passing in hurryd an without the ge oing through the screening steps , the  act  shall be considered as a risk and a threat , immediatly the visitor  shall be stopped by the security gaurds and the incident shall be investigated thouroughly ..

Try to inform the security soonest possible and keep moinitoring his moves