there r many types of jiang tou around...
from miao jiang,mao shan,thai,mian dian,tibet etc tec..
different jiang tou gt their own effect....there isnt a way to
identity if a person under jiang tou...but the simple layman way is
when a person to start behving wiredly or starts to hv strange
things happen to himself,.....ermmmm that person should start to
look for experts for advice liao...dun zhuo yi dai pi...