you can never be sure if a hack is vac² proof.. (in fact nothing is PROOF.. just undetected you know?
dont use hacks released before an vac update..
use a vac² update checker.. chod made one wich is easy to use..
(google)
dont use hacks longer then 2 days.. only use the newest releases..
but the only one you can trust about coding is urself, if you want a good hack wich is vac² proof.. start coding, read c++ /c# tuts, learn to read code languages, write some programms, read some vac² base codes..
and in maybe 5 years you have the ability to code your own vac² (maybe 4 then *lol*) hack.
have fun