CoD+Skins=ban?!

[checkmysix]

Hi Guys
Can someone Please Clarify for Me with a Yes\No answer..
Would Ban apply to Singleplayer in offline Mode or does it apply to Multiplayer online Mode Only?
I want to use Third party Skins and MODS in Singleplayer
Mode only for Machinema purposes and NOT for Online Gaming.
And if I switch to Offline in Steam will this make a Ban less likely
Or make no difference to detection in Account details
Thanks
Keith