Last month my sites got banned by google for invalid clicks. Is it possible to place new adsense codes in those websites which I've placed my banned code earlier last month?!
I would suggest you not to use it again. if they were banned once, they will be banned again with the same or similar charge. I would suggest you to use the same content to build a new site/domain wil be safer.
you can use it if only the publisher is banned, anyway you can always email our google friends and ask them about the site status..