u can get banned on test (dk) server.
simple test: try reporting some1 there. it's possible. thus it leaves some kind of record of ur actions to logs. and if there's some kind of suspicious actions on ur logs, and u somehow get reported + GMs are awake and care enough to check and go thru ur logs and actually do their jobs correctly and find something - yes, u will get banned ^^
AND: there has been loads of banned players on dksquare, my mage being 1 of them.
EDIT: Also this proves that some "GM detect" features does not work. No doupt about it anyways, its rather hard to test it anyways.
Feel free to tell me if u know a way, pretty much every1 has some sorta "GM detection" shyt. I'll just do the thing every time I get on yoshi or oread.. BOOM free mass spawn just for me..
Oh and if u have a way to test GM detect, pls use private messages