Location doesn't matter. However, anyone with the following in their name or clan name stands out to me:

QQ
legit
noob or n00b
l337 or any variation
pr0
i___u____ fill in the blanks (ie. ishootudie)
headshot
__-_-___ shit like that
asdof87hug shit like that
(((OveRDoSe))) I happen to know that entire clan hacks