VAC problem(s).

Hello there. I was wondering how does one use bhop scripts on a VAC secured server? More specifically, a Sandbox server on Garry's Mod. I have the xash.dll bypass, extreme injector, and my own LUA coded bhop script but when I try injecting the bhop script onto the server, and I type the "openscript_lua_cl" Console command or whatever, it doesn't work. I've seen someone use bhop scripts on a VAC secured DarkRP server, too so I know it's possible. Please help.