I honestly think they have a system similar to VAC. I only use drawings and maybe for 20 seconds out of a 35 minutes game I will use orbwalker.
Then how have people been scripting since 5.11 never get caught? I think people use evade when they say they haven't and use other programs when they say then haven't.
I started scripting just before 6.4 and all through 6.5 and never got hit in the ban wave.
I never use evade, I don't script every game and I don't kite past the abilities of my MMR bracket, unless ive played a hell of a lot of games with that champ.
Also keep in mind of the skill ceiling of the champ you want to script, for example, Lee SIn. He takes hours of practice and effort to play at a good level of understanding. You can't just start up a script never having played him before and not get caught.