well like the rules state, if im killed then straight away they are caught out. shiki's do not do well in sunlight, kinda makes them set themselves on fire so thats how. get them into the sun and they will be caught. another way is to cheack there body temp. shiki have cold blood unless ur a jubin
just because i said i was going to kill doesnt mean i'm going to do it blindly, only an idiot rushes into battle guns blazing
lol its pretty smiple into getting someone into the sunlight and if they refuse to do so then presume they are shiki, as for getting close just touching there hand will feel cold like ice but it might be hard to get that close unless ur a stalker