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From Valve Website:

All VAC bans are permanent - Valve has a zero-tolerance policy for cheating and will not lift >VAC bans under any circumstances.

Also,

Any third-party modification to a game designed to give one player an advantage over another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.

And

The following will not trigger a VAC ban:

• Using chat programs like X-Fire
• Playing multi-player mods which do not modify core .EXE and .DLL files
• System hardware configurations
• Updated system drivers, such as video card drivers
• Using custom skins, sounds or map

So if your mod fall into second category but not first, you should be okay :)

It might also be good to know that VAC bans don't happen instantly, usually a random time between a week - 2 months you will see this ban occur. This is to help stop the cheaters from knowing which hacks actually get pass VAC Security.

From the Steam KB:

###Important: All VAC bans are permanent - Valve has a zero-tolerance policy for cheating and will not lift VAC bans under any circumstances.

Also,

Any third-party modification to a game designed to give one player an advantage over another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.

And

The following will not trigger a VAC ban:

• Using chat programs like X-Fire
• Playing multi-player mods which do not modify core .EXE and .DLL files
• System hardware configurations
• Updated system drivers, such as video card drivers
• Using custom skins, sounds or map

So if your mod fall into second category but not first, you should be okay :)

It might also be good to know that VAC bans don't happen instantly, usually a random time between a week - 2 months you will see this ban occur. This is to help stop the cheaters from knowing which hacks actually get pass VAC Security.

From Valve Website:

All VAC bans are permanent - Valve has a zero-tolerance policy for cheating and will not lift >VAC bans under any circumstances.

Also,

Any third-party modification to a game designed to give one player an advantage over another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.

And

The following will not trigger a VAC ban:

• Using chat programs like X-Fire
• Playing multi-player mods which do not modify core .EXE and .DLL files
• System hardware configurations
• Updated system drivers, such as video card drivers
• Using custom skins, sounds or map

So if your mod fall into second category but not first, you should be okay :)

From Valve Website:

All VAC bans are permanent - Valve has a zero-tolerance policy for cheating and will not lift >VAC bans under any circumstances.

Also,

Any third-party modification to a game designed to give one player an advantage over another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.

And

The following will not trigger a VAC ban:

• Using chat programs like X-Fire
• Playing multi-player mods which do not modify core .EXE and .DLL files
• System hardware configurations
• Updated system drivers, such as video card drivers
• Using custom skins, sounds or map

So if your mod fall into second category but not first, you should be okay :)

It might also be good to know that VAC bans don't happen instantly, usually a random time between a week - 2 months you will see this ban occur. This is to help stop the cheaters from knowing which hacks actually get pass VAC Security.

From Valve Website:

All VAC bans are permanent - Valve has a zero-tolerance policy for cheating and will not lift >VAC bans under any circumstances.

Also,

Any third-party modification to a game designed to give one player an advantage over >another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.

And

The following will not trigger a VAC ban:

• Using chat programs like X-Fire
• Playing multi-player mods which do not modify core .EXE and .DLL files
• System hardware configurations
• Updated system drivers, such as video card drivers
• Using custom skins, sounds or map

So if your mod fall into second category but not first, you should be okay :)

From Valve Website:

All VAC bans are permanent - Valve has a zero-tolerance policy for cheating and will not lift >VAC bans under any circumstances.

Also,

Any third-party modification to a game designed to give one player an advantage over another is classified as a cheat or hack and will trigger a VAC ban. This includes modifications to a game's core executable files and dynamic link libraries.

And

The following will not trigger a VAC ban:

• Using chat programs like X-Fire
• Playing multi-player mods which do not modify core .EXE and .DLL files
• System hardware configurations
• Updated system drivers, such as video card drivers
• Using custom skins, sounds or map

So if your mod fall into second category but not first, you should be okay :)